Home / 642,639.20-886,842.18-356,177.78

Finding the Fourth Proportional to 642,639.20, 886,842.18 and 356,177.78

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Solution

The fourth proportional to 642,639.20, 886,842.18 and 356,177.78 is: 491,525.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,639.20 : 886,842.18 = 356,177.78 : x
  2. Step 2: Convert to fraction form
    642,639.20/886,842.18 = 356,177.78/x
  3. Step 3: Cross multiply
    642,639.20x = 886,842.18 × 356,177.78
  4. Step 4: Simplify right side
    642,639.20x = 315,873,478,882.76
  5. Step 5: Solve for x
    x = 315,873,478,882.76/642,639.20
  6. Step 6: Final answer
    x = 491,525.38

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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.