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Finding the Fourth Proportional to 146.50, 219.78 and 61

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Solution

The fourth proportional to 146.50, 219.78 and 61 is: 91.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.50 : 219.78 = 61 : x
  2. Step 2: Convert to fraction form
    146.50/219.78 = 61/x
  3. Step 3: Cross multiply
    146.50x = 219.78 × 61
  4. Step 4: Simplify right side
    146.50x = 13,406.58
  5. Step 5: Solve for x
    x = 13,406.58/146.50
  6. Step 6: Final answer
    x = 91.51

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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.