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Finding the Fourth Proportional to 243.31, 365.15 and 99.13

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Solution

The fourth proportional to 243.31, 365.15 and 99.13 is: 148.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.31 : 365.15 = 99.13 : x
  2. Step 2: Convert to fraction form
    243.31/365.15 = 99.13/x
  3. Step 3: Cross multiply
    243.31x = 365.15 × 99.13
  4. Step 4: Simplify right side
    243.31x = 36,197.32
  5. Step 5: Solve for x
    x = 36,197.32/243.31
  6. Step 6: Final answer
    x = 148.77

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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.