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Finding the Fourth Proportional to 782.13, 1,079.75 and 533.80

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Solution

The fourth proportional to 782.13, 1,079.75 and 533.80 is: 736.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    782.13 : 1,079.75 = 533.80 : x
  2. Step 2: Convert to fraction form
    782.13/1,079.75 = 533.80/x
  3. Step 3: Cross multiply
    782.13x = 1,079.75 × 533.80
  4. Step 4: Simplify right side
    782.13x = 576,370.55
  5. Step 5: Solve for x
    x = 576,370.55/782.13
  6. Step 6: Final answer
    x = 736.92

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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.