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Finding the Fourth Proportional to 99.61, 149.36 and 45.47

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Solution

The fourth proportional to 99.61, 149.36 and 45.47 is: 68.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.61 : 149.36 = 45.47 : x
  2. Step 2: Convert to fraction form
    99.61/149.36 = 45.47/x
  3. Step 3: Cross multiply
    99.61x = 149.36 × 45.47
  4. Step 4: Simplify right side
    99.61x = 6,791.55
  5. Step 5: Solve for x
    x = 6,791.55/99.61
  6. Step 6: Final answer
    x = 68.18

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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.