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Finding the Fourth Proportional to 100.13, 149.44 and 89.19

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Solution

The fourth proportional to 100.13, 149.44 and 89.19 is: 133.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.13 : 149.44 = 89.19 : x
  2. Step 2: Convert to fraction form
    100.13/149.44 = 89.19/x
  3. Step 3: Cross multiply
    100.13x = 149.44 × 89.19
  4. Step 4: Simplify right side
    100.13x = 13,328.55
  5. Step 5: Solve for x
    x = 13,328.55/100.13
  6. Step 6: Final answer
    x = 133.11

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.