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Finding the Fourth Proportional to 782.89, 1,079.67 and 502.63

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Solution

The fourth proportional to 782.89, 1,079.67 and 502.63 is: 693.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.89 : 1,079.67 = 502.63 : x
  2. Step 2: Convert to fraction form
    782.89/1,079.67 = 502.63/x
  3. Step 3: Cross multiply
    782.89x = 1,079.67 × 502.63
  4. Step 4: Simplify right side
    782.89x = 542,673.72
  5. Step 5: Solve for x
    x = 542,673.72/782.89
  6. Step 6: Final answer
    x = 693.17

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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.