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Finding the Fourth Proportional to 78,092, 117,066.72 and 28,131.20

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Solution

The fourth proportional to 78,092, 117,066.72 and 28,131.20 is: 42,171.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,092 : 117,066.72 = 28,131.20 : x
  2. Step 2: Convert to fraction form
    78,092/117,066.72 = 28,131.20/x
  3. Step 3: Cross multiply
    78,092x = 117,066.72 × 28,131.20
  4. Step 4: Simplify right side
    78,092x = 3,293,227,313.66
  5. Step 5: Solve for x
    x = 3,293,227,313.66/78,092
  6. Step 6: Final answer
    x = 42,171.12

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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.