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Finding the Fourth Proportional to 78,489.61, 117,808.39 and 28,617.91

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Solution

The fourth proportional to 78,489.61, 117,808.39 and 28,617.91 is: 42,953.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.61 : 117,808.39 = 28,617.91 : x
  2. Step 2: Convert to fraction form
    78,489.61/117,808.39 = 28,617.91/x
  3. Step 3: Cross multiply
    78,489.61x = 117,808.39 × 28,617.91
  4. Step 4: Simplify right side
    78,489.61x = 3,371,429,902.26
  5. Step 5: Solve for x
    x = 3,371,429,902.26/78,489.61
  6. Step 6: Final answer
    x = 42,953.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.