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Finding the Fourth Proportional to 99.69, 149.34 and 89.09

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Solution

The fourth proportional to 99.69, 149.34 and 89.09 is: 133.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.69 : 149.34 = 89.09 : x
  2. Step 2: Convert to fraction form
    99.69/149.34 = 89.09/x
  3. Step 3: Cross multiply
    99.69x = 149.34 × 89.09
  4. Step 4: Simplify right side
    99.69x = 13,305.41
  5. Step 5: Solve for x
    x = 13,305.41/99.69
  6. Step 6: Final answer
    x = 133.47

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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.