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Finding the Fourth Proportional to 863.40, 1,292.76 and 631.08

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Solution

The fourth proportional to 863.40, 1,292.76 and 631.08 is: 944.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.40 : 1,292.76 = 631.08 : x
  2. Step 2: Convert to fraction form
    863.40/1,292.76 = 631.08/x
  3. Step 3: Cross multiply
    863.40x = 1,292.76 × 631.08
  4. Step 4: Simplify right side
    863.40x = 815,834.98
  5. Step 5: Solve for x
    x = 815,834.98/863.40
  6. Step 6: Final answer
    x = 944.91

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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.