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Finding the Fourth Proportional to 155.18, 232.41 and 78.02

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Solution

The fourth proportional to 155.18, 232.41 and 78.02 is: 116.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.18 : 232.41 = 78.02 : x
  2. Step 2: Convert to fraction form
    155.18/232.41 = 78.02/x
  3. Step 3: Cross multiply
    155.18x = 232.41 × 78.02
  4. Step 4: Simplify right side
    155.18x = 18,132.63
  5. Step 5: Solve for x
    x = 18,132.63/155.18
  6. Step 6: Final answer
    x = 116.85

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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.