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Finding the Fourth Proportional to 99.63, 148.73 and 87.48

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Solution

The fourth proportional to 99.63, 148.73 and 87.48 is: 130.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.63 : 148.73 = 87.48 : x
  2. Step 2: Convert to fraction form
    99.63/148.73 = 87.48/x
  3. Step 3: Cross multiply
    99.63x = 148.73 × 87.48
  4. Step 4: Simplify right side
    99.63x = 13,010.90
  5. Step 5: Solve for x
    x = 13,010.90/99.63
  6. Step 6: Final answer
    x = 130.59

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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.