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Finding the Fourth Proportional to 146.87, 220.38 and 78.45

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Solution

The fourth proportional to 146.87, 220.38 and 78.45 is: 117.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.87 : 220.38 = 78.45 : x
  2. Step 2: Convert to fraction form
    146.87/220.38 = 78.45/x
  3. Step 3: Cross multiply
    146.87x = 220.38 × 78.45
  4. Step 4: Simplify right side
    146.87x = 17,288.81
  5. Step 5: Solve for x
    x = 17,288.81/146.87
  6. Step 6: Final answer
    x = 117.72

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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.