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Finding the Fourth Proportional to 78,616.18, 108,487.80 and 42,805.90

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Solution

The fourth proportional to 78,616.18, 108,487.80 and 42,805.90 is: 59,070.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,616.18 : 108,487.80 = 42,805.90 : x
  2. Step 2: Convert to fraction form
    78,616.18/108,487.80 = 42,805.90/x
  3. Step 3: Cross multiply
    78,616.18x = 108,487.80 × 42,805.90
  4. Step 4: Simplify right side
    78,616.18x = 4,643,917,918.02
  5. Step 5: Solve for x
    x = 4,643,917,918.02/78,616.18
  6. Step 6: Final answer
    x = 59,070.77

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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.