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Finding the Fourth Proportional to 642,640.14, 886,843.48 and 356,178.72

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Solution

The fourth proportional to 642,640.14, 886,843.48 and 356,178.72 is: 491,526.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,640.14 : 886,843.48 = 356,178.72 : x
  2. Step 2: Convert to fraction form
    642,640.14/886,843.48 = 356,178.72/x
  3. Step 3: Cross multiply
    642,640.14x = 886,843.48 × 356,178.72
  4. Step 4: Simplify right side
    642,640.14x = 315,874,773,765.85
  5. Step 5: Solve for x
    x = 315,874,773,765.85/642,640.14
  6. Step 6: Final answer
    x = 491,526.68

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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.