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Finding the Fourth Proportional to 102.24, 153.15 and 87.69

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Solution

The fourth proportional to 102.24, 153.15 and 87.69 is: 131.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.24 : 153.15 = 87.69 : x
  2. Step 2: Convert to fraction form
    102.24/153.15 = 87.69/x
  3. Step 3: Cross multiply
    102.24x = 153.15 × 87.69
  4. Step 4: Simplify right side
    102.24x = 13,429.72
  5. Step 5: Solve for x
    x = 13,429.72/102.24
  6. Step 6: Final answer
    x = 131.35

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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.