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Finding the Fourth Proportional to 863.13, 1,294.70 and 782.13

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Solution

The fourth proportional to 863.13, 1,294.70 and 782.13 is: 1,173.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    863.13 : 1,294.70 = 782.13 : x
  2. Step 2: Convert to fraction form
    863.13/1,294.70 = 782.13/x
  3. Step 3: Cross multiply
    863.13x = 1,294.70 × 782.13
  4. Step 4: Simplify right side
    863.13x = 1,012,619.80
  5. Step 5: Solve for x
    x = 1,012,619.80/863.13
  6. Step 6: Final answer
    x = 1,173.20

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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.