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Finding the Fourth Proportional to 1,279.92, 1,766.34 and 782.40

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Solution

The fourth proportional to 1,279.92, 1,766.34 and 782.40 is: 1,079.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.92 : 1,766.34 = 782.40 : x
  2. Step 2: Convert to fraction form
    1,279.92/1,766.34 = 782.40/x
  3. Step 3: Cross multiply
    1,279.92x = 1,766.34 × 782.40
  4. Step 4: Simplify right side
    1,279.92x = 1,381,984.42
  5. Step 5: Solve for x
    x = 1,381,984.42/1,279.92
  6. Step 6: Final answer
    x = 1,079.74

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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.