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Finding the Fourth Proportional to 728.16, 1,090.20 and 496.56

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Solution

The fourth proportional to 728.16, 1,090.20 and 496.56 is: 743.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.16 : 1,090.20 = 496.56 : x
  2. Step 2: Convert to fraction form
    728.16/1,090.20 = 496.56/x
  3. Step 3: Cross multiply
    728.16x = 1,090.20 × 496.56
  4. Step 4: Simplify right side
    728.16x = 541,349.71
  5. Step 5: Solve for x
    x = 541,349.71/728.16
  6. Step 6: Final answer
    x = 743.45

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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.