Home / 2,130.80-3,196.20-1,977.20

Finding the Fourth Proportional to 2,130.80, 3,196.20 and 1,977.20

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Solution

The fourth proportional to 2,130.80, 3,196.20 and 1,977.20 is: 2,965.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,130.80 : 3,196.20 = 1,977.20 : x
  2. Step 2: Convert to fraction form
    2,130.80/3,196.20 = 1,977.20/x
  3. Step 3: Cross multiply
    2,130.80x = 3,196.20 × 1,977.20
  4. Step 4: Simplify right side
    2,130.80x = 6,319,526.64
  5. Step 5: Solve for x
    x = 6,319,526.64/2,130.80
  6. Step 6: Final answer
    x = 2,965.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.