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Finding the Fourth Proportional to 99.05, 136.64 and 59.69

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Solution

The fourth proportional to 99.05, 136.64 and 59.69 is: 82.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.05 : 136.64 = 59.69 : x
  2. Step 2: Convert to fraction form
    99.05/136.64 = 59.69/x
  3. Step 3: Cross multiply
    99.05x = 136.64 × 59.69
  4. Step 4: Simplify right side
    99.05x = 8,156.53
  5. Step 5: Solve for x
    x = 8,156.53/99.05
  6. Step 6: Final answer
    x = 82.35

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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.