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Finding the Fourth Proportional to 782.96, 1,079.88 and 690.08

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Solution

The fourth proportional to 782.96, 1,079.88 and 690.08 is: 951.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.96 : 1,079.88 = 690.08 : x
  2. Step 2: Convert to fraction form
    782.96/1,079.88 = 690.08/x
  3. Step 3: Cross multiply
    782.96x = 1,079.88 × 690.08
  4. Step 4: Simplify right side
    782.96x = 745,203.59
  5. Step 5: Solve for x
    x = 745,203.59/782.96
  6. Step 6: Final answer
    x = 951.78

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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.