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Finding the Fourth Proportional to 782.63, 1,079.72 and 502.82

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Solution

The fourth proportional to 782.63, 1,079.72 and 502.82 is: 693.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.63 : 1,079.72 = 502.82 : x
  2. Step 2: Convert to fraction form
    782.63/1,079.72 = 502.82/x
  3. Step 3: Cross multiply
    782.63x = 1,079.72 × 502.82
  4. Step 4: Simplify right side
    782.63x = 542,896.90
  5. Step 5: Solve for x
    x = 542,896.90/782.63
  6. Step 6: Final answer
    x = 693.69

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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.