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Finding the Fourth Proportional to 100.87, 150.63 and 86.27

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Solution

The fourth proportional to 100.87, 150.63 and 86.27 is: 128.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.87 : 150.63 = 86.27 : x
  2. Step 2: Convert to fraction form
    100.87/150.63 = 86.27/x
  3. Step 3: Cross multiply
    100.87x = 150.63 × 86.27
  4. Step 4: Simplify right side
    100.87x = 12,994.62
  5. Step 5: Solve for x
    x = 12,994.62/100.87
  6. Step 6: Final answer
    x = 128.83

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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.