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Finding the Fourth Proportional to 726.72, 1,090.80 and 508.20

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Solution

The fourth proportional to 726.72, 1,090.80 and 508.20 is: 762.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.72 : 1,090.80 = 508.20 : x
  2. Step 2: Convert to fraction form
    726.72/1,090.80 = 508.20/x
  3. Step 3: Cross multiply
    726.72x = 1,090.80 × 508.20
  4. Step 4: Simplify right side
    726.72x = 554,344.56
  5. Step 5: Solve for x
    x = 554,344.56/726.72
  6. Step 6: Final answer
    x = 762.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.