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Finding the Fourth Proportional to 981.87, 1,472.40 and 433.66

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Solution

The fourth proportional to 981.87, 1,472.40 and 433.66 is: 650.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.87 : 1,472.40 = 433.66 : x
  2. Step 2: Convert to fraction form
    981.87/1,472.40 = 433.66/x
  3. Step 3: Cross multiply
    981.87x = 1,472.40 × 433.66
  4. Step 4: Simplify right side
    981.87x = 638,520.98
  5. Step 5: Solve for x
    x = 638,520.98/981.87
  6. Step 6: Final answer
    x = 650.31

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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.