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Finding the Fourth Proportional to 78,701.65, 108,605.10 and 42,890.89

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Solution

The fourth proportional to 78,701.65, 108,605.10 and 42,890.89 is: 59,187.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.65 : 108,605.10 = 42,890.89 : x
  2. Step 2: Convert to fraction form
    78,701.65/108,605.10 = 42,890.89/x
  3. Step 3: Cross multiply
    78,701.65x = 108,605.10 × 42,890.89
  4. Step 4: Simplify right side
    78,701.65x = 4,658,169,286.87
  5. Step 5: Solve for x
    x = 4,658,169,286.87/78,701.65
  6. Step 6: Final answer
    x = 59,187.70

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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.