Home / 3,146.72-4,343.25-1,821.20

Finding the Fourth Proportional to 3,146.72, 4,343.25 and 1,821.20

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Solution

The fourth proportional to 3,146.72, 4,343.25 and 1,821.20 is: 2,513.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,146.72 : 4,343.25 = 1,821.20 : x
  2. Step 2: Convert to fraction form
    3,146.72/4,343.25 = 1,821.20/x
  3. Step 3: Cross multiply
    3,146.72x = 4,343.25 × 1,821.20
  4. Step 4: Simplify right side
    3,146.72x = 7,909,905.18
  5. Step 5: Solve for x
    x = 7,909,905.18/3,146.72
  6. Step 6: Final answer
    x = 2,513.70

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Double scale
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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.