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Finding the Fourth Proportional to 78,356.58, 108,129.29 and 42,545.85

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Solution

The fourth proportional to 78,356.58, 108,129.29 and 42,545.85 is: 58,711.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,356.58 : 108,129.29 = 42,545.85 : x
  2. Step 2: Convert to fraction form
    78,356.58/108,129.29 = 42,545.85/x
  3. Step 3: Cross multiply
    78,356.58x = 108,129.29 × 42,545.85
  4. Step 4: Simplify right side
    78,356.58x = 4,600,452,340.22
  5. Step 5: Solve for x
    x = 4,600,452,340.22/78,356.58
  6. Step 6: Final answer
    x = 58,711.76

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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.