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Finding the Fourth Proportional to 950.40, 1,311.26 and 657.18

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Solution

The fourth proportional to 950.40, 1,311.26 and 657.18 is: 906.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    950.40 : 1,311.26 = 657.18 : x
  2. Step 2: Convert to fraction form
    950.40/1,311.26 = 657.18/x
  3. Step 3: Cross multiply
    950.40x = 1,311.26 × 657.18
  4. Step 4: Simplify right side
    950.40x = 861,730.56
  5. Step 5: Solve for x
    x = 861,730.56/950.40
  6. Step 6: Final answer
    x = 906.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.