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Finding the Fourth Proportional to 100.29, 149.82 and 85.77

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Solution

The fourth proportional to 100.29, 149.82 and 85.77 is: 128.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.29 : 149.82 = 85.77 : x
  2. Step 2: Convert to fraction form
    100.29/149.82 = 85.77/x
  3. Step 3: Cross multiply
    100.29x = 149.82 × 85.77
  4. Step 4: Simplify right side
    100.29x = 12,850.06
  5. Step 5: Solve for x
    x = 12,850.06/100.29
  6. Step 6: Final answer
    x = 128.13

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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.