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Finding the Fourth Proportional to 147.32, 220.95 and 78.85

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Solution

The fourth proportional to 147.32, 220.95 and 78.85 is: 118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.32 : 220.95 = 78.85 : x
  2. Step 2: Convert to fraction form
    147.32/220.95 = 78.85/x
  3. Step 3: Cross multiply
    147.32x = 220.95 × 78.85
  4. Step 4: Simplify right side
    147.32x = 17,421.78
  5. Step 5: Solve for x
    x = 17,421.78/147.32
  6. Step 6: Final answer
    x = 118.26

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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.