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Finding the Fourth Proportional to 628,642.76, 867,545.82 and 387,064.71

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Solution

The fourth proportional to 628,642.76, 867,545.82 and 387,064.71 is: 534,160.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    628,642.76 : 867,545.82 = 387,064.71 : x
  2. Step 2: Convert to fraction form
    628,642.76/867,545.82 = 387,064.71/x
  3. Step 3: Cross multiply
    628,642.76x = 867,545.82 × 387,064.71
  4. Step 4: Simplify right side
    628,642.76x = 335,796,369,294.69
  5. Step 5: Solve for x
    x = 335,796,369,294.69/628,642.76
  6. Step 6: Final answer
    x = 534,160.88

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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.