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Finding the Fourth Proportional to 99.79, 136.95 and 97.21

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Solution

The fourth proportional to 99.79, 136.95 and 97.21 is: 133.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.79 : 136.95 = 97.21 : x
  2. Step 2: Convert to fraction form
    99.79/136.95 = 97.21/x
  3. Step 3: Cross multiply
    99.79x = 136.95 × 97.21
  4. Step 4: Simplify right side
    99.79x = 13,312.60
  5. Step 5: Solve for x
    x = 13,312.60/99.79
  6. Step 6: Final answer
    x = 133.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.