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Finding the Fourth Proportional to 782.06, 1,079.12 and 502.31

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Solution

The fourth proportional to 782.06, 1,079.12 and 502.31 is: 693.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.06 : 1,079.12 = 502.31 : x
  2. Step 2: Convert to fraction form
    782.06/1,079.12 = 502.31/x
  3. Step 3: Cross multiply
    782.06x = 1,079.12 × 502.31
  4. Step 4: Simplify right side
    782.06x = 542,056.72
  5. Step 5: Solve for x
    x = 542,056.72/782.06
  6. Step 6: Final answer
    x = 693.12

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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.