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Finding the Fourth Proportional to 728.17, 1,090.80 and 357.26

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Solution

The fourth proportional to 728.17, 1,090.80 and 357.26 is: 535.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.17 : 1,090.80 = 357.26 : x
  2. Step 2: Convert to fraction form
    728.17/1,090.80 = 357.26/x
  3. Step 3: Cross multiply
    728.17x = 1,090.80 × 357.26
  4. Step 4: Simplify right side
    728.17x = 389,693.75
  5. Step 5: Solve for x
    x = 389,693.75/728.17
  6. Step 6: Final answer
    x = 535.17

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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.