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Finding the Fourth Proportional to 99.55, 148.51 and 87.31

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Solution

The fourth proportional to 99.55, 148.51 and 87.31 is: 130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.55 : 148.51 = 87.31 : x
  2. Step 2: Convert to fraction form
    99.55/148.51 = 87.31/x
  3. Step 3: Cross multiply
    99.55x = 148.51 × 87.31
  4. Step 4: Simplify right side
    99.55x = 12,966.41
  5. Step 5: Solve for x
    x = 12,966.41/99.55
  6. Step 6: Final answer
    x = 130.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.