Home / 3,897.42-5,378.52-2,129.10

Finding the Fourth Proportional to 3,897.42, 5,378.52 and 2,129.10

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Solution

The fourth proportional to 3,897.42, 5,378.52 and 2,129.10 is: 2,938.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,897.42 : 5,378.52 = 2,129.10 : x
  2. Step 2: Convert to fraction form
    3,897.42/5,378.52 = 2,129.10/x
  3. Step 3: Cross multiply
    3,897.42x = 5,378.52 × 2,129.10
  4. Step 4: Simplify right side
    3,897.42x = 11,451,406.93
  5. Step 5: Solve for x
    x = 11,451,406.93/3,897.42
  6. Step 6: Final answer
    x = 2,938.20

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Find fourth proportional to 1,948.71, 2,689.26 and 1,064.55
Half scale
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Double scale
Find fourth proportional to 3,898.42, 5,379.90 and 2,130.10
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.