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Finding the Fourth Proportional to 78,565.92, 108,419.41 and 42,756.54

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Solution

The fourth proportional to 78,565.92, 108,419.41 and 42,756.54 is: 59,003.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,565.92 : 108,419.41 = 42,756.54 : x
  2. Step 2: Convert to fraction form
    78,565.92/108,419.41 = 42,756.54/x
  3. Step 3: Cross multiply
    78,565.92x = 108,419.41 × 42,756.54
  4. Step 4: Simplify right side
    78,565.92x = 4,635,638,840.44
  5. Step 5: Solve for x
    x = 4,635,638,840.44/78,565.92
  6. Step 6: Final answer
    x = 59,003.18

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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.