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Finding the Fourth Proportional to 99.72, 149.18 and 68.94

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Solution

The fourth proportional to 99.72, 149.18 and 68.94 is: 103.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.72 : 149.18 = 68.94 : x
  2. Step 2: Convert to fraction form
    99.72/149.18 = 68.94/x
  3. Step 3: Cross multiply
    99.72x = 149.18 × 68.94
  4. Step 4: Simplify right side
    99.72x = 10,284.12
  5. Step 5: Solve for x
    x = 10,284.12/99.72
  6. Step 6: Final answer
    x = 103.13

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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.