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Finding the Fourth Proportional to 981.60, 1,472.40 and 404.64

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Solution

The fourth proportional to 981.60, 1,472.40 and 404.64 is: 606.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.60 : 1,472.40 = 404.64 : x
  2. Step 2: Convert to fraction form
    981.60/1,472.40 = 404.64/x
  3. Step 3: Cross multiply
    981.60x = 1,472.40 × 404.64
  4. Step 4: Simplify right side
    981.60x = 595,791.94
  5. Step 5: Solve for x
    x = 595,791.94/981.60
  6. Step 6: Final answer
    x = 606.96

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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.