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Finding the Fourth Proportional to 99.52, 137.30 and 65.08

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Solution

The fourth proportional to 99.52, 137.30 and 65.08 is: 89.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.52 : 137.30 = 65.08 : x
  2. Step 2: Convert to fraction form
    99.52/137.30 = 65.08/x
  3. Step 3: Cross multiply
    99.52x = 137.30 × 65.08
  4. Step 4: Simplify right side
    99.52x = 8,935.48
  5. Step 5: Solve for x
    x = 8,935.48/99.52
  6. Step 6: Final answer
    x = 89.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.