Home / 642,823.40-887,036.64-356,319.12

Finding the Fourth Proportional to 642,823.40, 887,036.64 and 356,319.12

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Solution

The fourth proportional to 642,823.40, 887,036.64 and 356,319.12 is: 491,687.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,823.40 : 887,036.64 = 356,319.12 : x
  2. Step 2: Convert to fraction form
    642,823.40/887,036.64 = 356,319.12/x
  3. Step 3: Cross multiply
    642,823.40x = 887,036.64 × 356,319.12
  4. Step 4: Simplify right side
    642,823.40x = 316,068,114,972.56
  5. Step 5: Solve for x
    x = 316,068,114,972.56/642,823.40
  6. Step 6: Final answer
    x = 491,687.32

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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.