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Finding the Fourth Proportional to 99.92, 150.62 and 91.28

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Solution

The fourth proportional to 99.92, 150.62 and 91.28 is: 137.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.92 : 150.62 = 91.28 : x
  2. Step 2: Convert to fraction form
    99.92/150.62 = 91.28/x
  3. Step 3: Cross multiply
    99.92x = 150.62 × 91.28
  4. Step 4: Simplify right side
    99.92x = 13,748.59
  5. Step 5: Solve for x
    x = 13,748.59/99.92
  6. Step 6: Final answer
    x = 137.60

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.