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Finding the Fourth Proportional to 981.78, 1,472.67 and 332.49

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Solution

The fourth proportional to 981.78, 1,472.67 and 332.49 is: 498.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,472.67 = 332.49 : x
  2. Step 2: Convert to fraction form
    981.78/1,472.67 = 332.49/x
  3. Step 3: Cross multiply
    981.78x = 1,472.67 × 332.49
  4. Step 4: Simplify right side
    981.78x = 489,648.05
  5. Step 5: Solve for x
    x = 489,648.05/981.78
  6. Step 6: Final answer
    x = 498.74

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Double scale
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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.