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Finding the Fourth Proportional to 728.67, 1,090.80 and 543.09

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Solution

The fourth proportional to 728.67, 1,090.80 and 543.09 is: 812.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.67 : 1,090.80 = 543.09 : x
  2. Step 2: Convert to fraction form
    728.67/1,090.80 = 543.09/x
  3. Step 3: Cross multiply
    728.67x = 1,090.80 × 543.09
  4. Step 4: Simplify right side
    728.67x = 592,402.57
  5. Step 5: Solve for x
    x = 592,402.57/728.67
  6. Step 6: Final answer
    x = 812.99

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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.