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Finding the Fourth Proportional to 147.40, 219.68 and 143.44

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Solution

The fourth proportional to 147.40, 219.68 and 143.44 is: 213.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.40 : 219.68 = 143.44 : x
  2. Step 2: Convert to fraction form
    147.40/219.68 = 143.44/x
  3. Step 3: Cross multiply
    147.40x = 219.68 × 143.44
  4. Step 4: Simplify right side
    147.40x = 31,510.90
  5. Step 5: Solve for x
    x = 31,510.90/147.40
  6. Step 6: Final answer
    x = 213.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.