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Finding the Fourth Proportional to 99.34, 136.36 and 90.70

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Solution

The fourth proportional to 99.34, 136.36 and 90.70 is: 124.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.34 : 136.36 = 90.70 : x
  2. Step 2: Convert to fraction form
    99.34/136.36 = 90.70/x
  3. Step 3: Cross multiply
    99.34x = 136.36 × 90.70
  4. Step 4: Simplify right side
    99.34x = 12,367.85
  5. Step 5: Solve for x
    x = 12,367.85/99.34
  6. Step 6: Final answer
    x = 124.50

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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.