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Finding the Fourth Proportional to 100.13, 149.51 and 89.78

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Solution

The fourth proportional to 100.13, 149.51 and 89.78 is: 134.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.13 : 149.51 = 89.78 : x
  2. Step 2: Convert to fraction form
    100.13/149.51 = 89.78/x
  3. Step 3: Cross multiply
    100.13x = 149.51 × 89.78
  4. Step 4: Simplify right side
    100.13x = 13,423.01
  5. Step 5: Solve for x
    x = 13,423.01/100.13
  6. Step 6: Final answer
    x = 134.06

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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.