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Finding the Fourth Proportional to 78,487.39, 117,659.87 and 28,532.21

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Solution

The fourth proportional to 78,487.39, 117,659.87 and 28,532.21 is: 42,772.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,487.39 : 117,659.87 = 28,532.21 : x
  2. Step 2: Convert to fraction form
    78,487.39/117,659.87 = 28,532.21/x
  3. Step 3: Cross multiply
    78,487.39x = 117,659.87 × 28,532.21
  4. Step 4: Simplify right side
    78,487.39x = 3,357,095,602.44
  5. Step 5: Solve for x
    x = 3,357,095,602.44/78,487.39
  6. Step 6: Final answer
    x = 42,772.42

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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.