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Finding the Fourth Proportional to 99.56, 148.98 and 86.88

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Solution

The fourth proportional to 99.56, 148.98 and 86.88 is: 130.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.56 : 148.98 = 86.88 : x
  2. Step 2: Convert to fraction form
    99.56/148.98 = 86.88/x
  3. Step 3: Cross multiply
    99.56x = 148.98 × 86.88
  4. Step 4: Simplify right side
    99.56x = 12,943.38
  5. Step 5: Solve for x
    x = 12,943.38/99.56
  6. Step 6: Final answer
    x = 130.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.