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Finding the Fourth Proportional to 99.74, 150.18 and 88.40

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Solution

The fourth proportional to 99.74, 150.18 and 88.40 is: 133.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.74 : 150.18 = 88.40 : x
  2. Step 2: Convert to fraction form
    99.74/150.18 = 88.40/x
  3. Step 3: Cross multiply
    99.74x = 150.18 × 88.40
  4. Step 4: Simplify right side
    99.74x = 13,275.91
  5. Step 5: Solve for x
    x = 13,275.91/99.74
  6. Step 6: Final answer
    x = 133.11

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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.