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Finding the Fourth Proportional to 642,545.28, 886,717.44 and 356,070

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Solution

The fourth proportional to 642,545.28, 886,717.44 and 356,070 is: 491,379.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,545.28 : 886,717.44 = 356,070 : x
  2. Step 2: Convert to fraction form
    642,545.28/886,717.44 = 356,070/x
  3. Step 3: Cross multiply
    642,545.28x = 886,717.44 × 356,070
  4. Step 4: Simplify right side
    642,545.28x = 315,733,478,860.80
  5. Step 5: Solve for x
    x = 315,733,478,860.80/642,545.28
  6. Step 6: Final answer
    x = 491,379.35

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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.