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Finding the Fourth Proportional to 649.60, 974.40 and 187.42

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Solution

The fourth proportional to 649.60, 974.40 and 187.42 is: 281.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    649.60 : 974.40 = 187.42 : x
  2. Step 2: Convert to fraction form
    649.60/974.40 = 187.42/x
  3. Step 3: Cross multiply
    649.60x = 974.40 × 187.42
  4. Step 4: Simplify right side
    649.60x = 182,622.05
  5. Step 5: Solve for x
    x = 182,622.05/649.60
  6. Step 6: Final answer
    x = 281.13

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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.