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Finding the Fourth Proportional to 78,600.98, 108,468.70 and 42,790.92

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Solution

The fourth proportional to 78,600.98, 108,468.70 and 42,790.92 is: 59,051.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,600.98 : 108,468.70 = 42,790.92 : x
  2. Step 2: Convert to fraction form
    78,600.98/108,468.70 = 42,790.92/x
  3. Step 3: Cross multiply
    78,600.98x = 108,468.70 × 42,790.92
  4. Step 4: Simplify right side
    78,600.98x = 4,641,475,191.17
  5. Step 5: Solve for x
    x = 4,641,475,191.17/78,600.98
  6. Step 6: Final answer
    x = 59,051.11

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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.