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Finding the Fourth Proportional to 981.44, 1,472.16 and 388.52

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Solution

The fourth proportional to 981.44, 1,472.16 and 388.52 is: 582.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.44 : 1,472.16 = 388.52 : x
  2. Step 2: Convert to fraction form
    981.44/1,472.16 = 388.52/x
  3. Step 3: Cross multiply
    981.44x = 1,472.16 × 388.52
  4. Step 4: Simplify right side
    981.44x = 571,956.24
  5. Step 5: Solve for x
    x = 571,956.24/981.44
  6. Step 6: Final answer
    x = 582.78

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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.