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Finding the Fourth Proportional to 981.18, 1,472.31 and 433.62

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Solution

The fourth proportional to 981.18, 1,472.31 and 433.62 is: 650.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.18 : 1,472.31 = 433.62 : x
  2. Step 2: Convert to fraction form
    981.18/1,472.31 = 433.62/x
  3. Step 3: Cross multiply
    981.18x = 1,472.31 × 433.62
  4. Step 4: Simplify right side
    981.18x = 638,423.06
  5. Step 5: Solve for x
    x = 638,423.06/981.18
  6. Step 6: Final answer
    x = 650.67

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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.