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Finding the Fourth Proportional to 99.14, 136.84 and 64.18

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Solution

The fourth proportional to 99.14, 136.84 and 64.18 is: 88.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.14 : 136.84 = 64.18 : x
  2. Step 2: Convert to fraction form
    99.14/136.84 = 64.18/x
  3. Step 3: Cross multiply
    99.14x = 136.84 × 64.18
  4. Step 4: Simplify right side
    99.14x = 8,782.39
  5. Step 5: Solve for x
    x = 8,782.39/99.14
  6. Step 6: Final answer
    x = 88.59

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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.