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Finding the Fourth Proportional to 728.45, 1,090.91 and 454.19

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Solution

The fourth proportional to 728.45, 1,090.91 and 454.19 is: 680.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.45 : 1,090.91 = 454.19 : x
  2. Step 2: Convert to fraction form
    728.45/1,090.91 = 454.19/x
  3. Step 3: Cross multiply
    728.45x = 1,090.91 × 454.19
  4. Step 4: Simplify right side
    728.45x = 495,484.28
  5. Step 5: Solve for x
    x = 495,484.28/728.45
  6. Step 6: Final answer
    x = 680.19

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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.