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Finding the Fourth Proportional to 981.78, 1,472.85 and 404.34

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Solution

The fourth proportional to 981.78, 1,472.85 and 404.34 is: 606.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.78 : 1,472.85 = 404.34 : x
  2. Step 2: Convert to fraction form
    981.78/1,472.85 = 404.34/x
  3. Step 3: Cross multiply
    981.78x = 1,472.85 × 404.34
  4. Step 4: Simplify right side
    981.78x = 595,532.17
  5. Step 5: Solve for x
    x = 595,532.17/981.78
  6. Step 6: Final answer
    x = 606.58

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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.