Home / 642,825.50-887,039.55-356,321.21

Finding the Fourth Proportional to 642,825.50, 887,039.55 and 356,321.21

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Solution

The fourth proportional to 642,825.50, 887,039.55 and 356,321.21 is: 491,690.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,825.50 : 887,039.55 = 356,321.21 : x
  2. Step 2: Convert to fraction form
    642,825.50/887,039.55 = 356,321.21/x
  3. Step 3: Cross multiply
    642,825.50x = 887,039.55 × 356,321.21
  4. Step 4: Simplify right side
    642,825.50x = 316,071,005,773.86
  5. Step 5: Solve for x
    x = 316,071,005,773.86/642,825.50
  6. Step 6: Final answer
    x = 491,690.21

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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.