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Finding the Fourth Proportional to 146.61, 220.05 and 78.19

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Solution

The fourth proportional to 146.61, 220.05 and 78.19 is: 117.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.61 : 220.05 = 78.19 : x
  2. Step 2: Convert to fraction form
    146.61/220.05 = 78.19/x
  3. Step 3: Cross multiply
    146.61x = 220.05 × 78.19
  4. Step 4: Simplify right side
    146.61x = 17,206.40
  5. Step 5: Solve for x
    x = 17,206.40/146.61
  6. Step 6: Final answer
    x = 117.36

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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.