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Finding the Fourth Proportional to 143.23, 215.02 and 74.80

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Solution

The fourth proportional to 143.23, 215.02 and 74.80 is: 112.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.23 : 215.02 = 74.80 : x
  2. Step 2: Convert to fraction form
    143.23/215.02 = 74.80/x
  3. Step 3: Cross multiply
    143.23x = 215.02 × 74.80
  4. Step 4: Simplify right side
    143.23x = 16,082.42
  5. Step 5: Solve for x
    x = 16,082.42/143.23
  6. Step 6: Final answer
    x = 112.29

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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.