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Finding the Fourth Proportional to 863.80, 1,295.63 and 425.18

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Solution

The fourth proportional to 863.80, 1,295.63 and 425.18 is: 637.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.80 : 1,295.63 = 425.18 : x
  2. Step 2: Convert to fraction form
    863.80/1,295.63 = 425.18/x
  3. Step 3: Cross multiply
    863.80x = 1,295.63 × 425.18
  4. Step 4: Simplify right side
    863.80x = 550,878.67
  5. Step 5: Solve for x
    x = 550,878.67/863.80
  6. Step 6: Final answer
    x = 637.74

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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.