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Finding the Fourth Proportional to 100.85, 150.89 and 87.03

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Solution

The fourth proportional to 100.85, 150.89 and 87.03 is: 130.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.85 : 150.89 = 87.03 : x
  2. Step 2: Convert to fraction form
    100.85/150.89 = 87.03/x
  3. Step 3: Cross multiply
    100.85x = 150.89 × 87.03
  4. Step 4: Simplify right side
    100.85x = 13,131.96
  5. Step 5: Solve for x
    x = 13,131.96/100.85
  6. Step 6: Final answer
    x = 130.21

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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.