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Finding the Fourth Proportional to 78,549.91, 117,753.37 and 28,618.63

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Solution

The fourth proportional to 78,549.91, 117,753.37 and 28,618.63 is: 42,901.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,549.91 : 117,753.37 = 28,618.63 : x
  2. Step 2: Convert to fraction form
    78,549.91/117,753.37 = 28,618.63/x
  3. Step 3: Cross multiply
    78,549.91x = 117,753.37 × 28,618.63
  4. Step 4: Simplify right side
    78,549.91x = 3,369,940,127.28
  5. Step 5: Solve for x
    x = 3,369,940,127.28/78,549.91
  6. Step 6: Final answer
    x = 42,901.90

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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.