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Finding the Fourth Proportional to 99.15, 148.56 and 63

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Solution

The fourth proportional to 99.15, 148.56 and 63 is: 94.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.15 : 148.56 = 63 : x
  2. Step 2: Convert to fraction form
    99.15/148.56 = 63/x
  3. Step 3: Cross multiply
    99.15x = 148.56 × 63
  4. Step 4: Simplify right side
    99.15x = 9,359.28
  5. Step 5: Solve for x
    x = 9,359.28/99.15
  6. Step 6: Final answer
    x = 94.40

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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.