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Finding the Fourth Proportional to 100.01, 149.72 and 89.65

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Solution

The fourth proportional to 100.01, 149.72 and 89.65 is: 134.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.01 : 149.72 = 89.65 : x
  2. Step 2: Convert to fraction form
    100.01/149.72 = 89.65/x
  3. Step 3: Cross multiply
    100.01x = 149.72 × 89.65
  4. Step 4: Simplify right side
    100.01x = 13,422.25
  5. Step 5: Solve for x
    x = 13,422.25/100.01
  6. Step 6: Final answer
    x = 134.21

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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.