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Finding the Fourth Proportional to 951.87, 1,427.71 and 645.69

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Solution

The fourth proportional to 951.87, 1,427.71 and 645.69 is: 968.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    951.87 : 1,427.71 = 645.69 : x
  2. Step 2: Convert to fraction form
    951.87/1,427.71 = 645.69/x
  3. Step 3: Cross multiply
    951.87x = 1,427.71 × 645.69
  4. Step 4: Simplify right side
    951.87x = 921,847.70
  5. Step 5: Solve for x
    x = 921,847.70/951.87
  6. Step 6: Final answer
    x = 968.46

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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.