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Finding the Fourth Proportional to 144,007.60, 215,719.80 and 81,605.20

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Solution

The fourth proportional to 144,007.60, 215,719.80 and 81,605.20 is: 122,242.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    144,007.60 : 215,719.80 = 81,605.20 : x
  2. Step 2: Convert to fraction form
    144,007.60/215,719.80 = 81,605.20/x
  3. Step 3: Cross multiply
    144,007.60x = 215,719.80 × 81,605.20
  4. Step 4: Simplify right side
    144,007.60x = 17,603,857,422.96
  5. Step 5: Solve for x
    x = 17,603,857,422.96/144,007.60
  6. Step 6: Final answer
    x = 122,242.56

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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.