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Finding the Fourth Proportional to 642,728.32, 887,018.16 and 356,338.24

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Solution

The fourth proportional to 642,728.32, 887,018.16 and 356,338.24 is: 491,776.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,728.32 : 887,018.16 = 356,338.24 : x
  2. Step 2: Convert to fraction form
    642,728.32/887,018.16 = 356,338.24/x
  3. Step 3: Cross multiply
    642,728.32x = 887,018.16 × 356,338.24
  4. Step 4: Simplify right side
    642,728.32x = 316,078,489,982.44
  5. Step 5: Solve for x
    x = 316,078,489,982.44/642,728.32
  6. Step 6: Final answer
    x = 491,776.20

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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.