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Finding the Fourth Proportional to 146.62, 220.01 and 78.20

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Solution

The fourth proportional to 146.62, 220.01 and 78.20 is: 117.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.62 : 220.01 = 78.20 : x
  2. Step 2: Convert to fraction form
    146.62/220.01 = 78.20/x
  3. Step 3: Cross multiply
    146.62x = 220.01 × 78.20
  4. Step 4: Simplify right side
    146.62x = 17,204.78
  5. Step 5: Solve for x
    x = 17,204.78/146.62
  6. Step 6: Final answer
    x = 117.34

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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.