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Finding the Fourth Proportional to 78,616.36, 108,489.17 and 42,805.72

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Solution

The fourth proportional to 78,616.36, 108,489.17 and 42,805.72 is: 59,071.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,616.36 : 108,489.17 = 42,805.72 : x
  2. Step 2: Convert to fraction form
    78,616.36/108,489.17 = 42,805.72/x
  3. Step 3: Cross multiply
    78,616.36x = 108,489.17 × 42,805.72
  4. Step 4: Simplify right side
    78,616.36x = 4,643,956,277.58
  5. Step 5: Solve for x
    x = 4,643,956,277.58/78,616.36
  6. Step 6: Final answer
    x = 59,071.12

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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.