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Finding the Fourth Proportional to 99.92, 138 and 98.57

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Solution

The fourth proportional to 99.92, 138 and 98.57 is: 136.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.92 : 138 = 98.57 : x
  2. Step 2: Convert to fraction form
    99.92/138 = 98.57/x
  3. Step 3: Cross multiply
    99.92x = 138 × 98.57
  4. Step 4: Simplify right side
    99.92x = 13,602.66
  5. Step 5: Solve for x
    x = 13,602.66/99.92
  6. Step 6: Final answer
    x = 136.14

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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.