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Finding the Fourth Proportional to 155.36, 233.10 and 87

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Solution

The fourth proportional to 155.36, 233.10 and 87 is: 130.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.36 : 233.10 = 87 : x
  2. Step 2: Convert to fraction form
    155.36/233.10 = 87/x
  3. Step 3: Cross multiply
    155.36x = 233.10 × 87
  4. Step 4: Simplify right side
    155.36x = 20,279.70
  5. Step 5: Solve for x
    x = 20,279.70/155.36
  6. Step 6: Final answer
    x = 130.54

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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.