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Finding the Fourth Proportional to 981.96, 1,472.08 and 396.60

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Solution

The fourth proportional to 981.96, 1,472.08 and 396.60 is: 594.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.96 : 1,472.08 = 396.60 : x
  2. Step 2: Convert to fraction form
    981.96/1,472.08 = 396.60/x
  3. Step 3: Cross multiply
    981.96x = 1,472.08 × 396.60
  4. Step 4: Simplify right side
    981.96x = 583,826.93
  5. Step 5: Solve for x
    x = 583,826.93/981.96
  6. Step 6: Final answer
    x = 594.55

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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.