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Finding the Fourth Proportional to 78,609.15, 108,478.17 and 42,798.92

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Solution

The fourth proportional to 78,609.15, 108,478.17 and 42,798.92 is: 59,061.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,609.15 : 108,478.17 = 42,798.92 : x
  2. Step 2: Convert to fraction form
    78,609.15/108,478.17 = 42,798.92/x
  3. Step 3: Cross multiply
    78,609.15x = 108,478.17 × 42,798.92
  4. Step 4: Simplify right side
    78,609.15x = 4,642,747,977.19
  5. Step 5: Solve for x
    x = 4,642,747,977.19/78,609.15
  6. Step 6: Final answer
    x = 59,061.16

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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.