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Finding the Fourth Proportional to 146.16, 219.12 and 76.72

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Solution

The fourth proportional to 146.16, 219.12 and 76.72 is: 115.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.16 : 219.12 = 76.72 : x
  2. Step 2: Convert to fraction form
    146.16/219.12 = 76.72/x
  3. Step 3: Cross multiply
    146.16x = 219.12 × 76.72
  4. Step 4: Simplify right side
    146.16x = 16,810.63
  5. Step 5: Solve for x
    x = 16,810.63/146.16
  6. Step 6: Final answer
    x = 115.02

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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.