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Finding the Fourth Proportional to 728.12, 1,004.64 and 433.28

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Solution

The fourth proportional to 728.12, 1,004.64 and 433.28 is: 597.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.12 : 1,004.64 = 433.28 : x
  2. Step 2: Convert to fraction form
    728.12/1,004.64 = 433.28/x
  3. Step 3: Cross multiply
    728.12x = 1,004.64 × 433.28
  4. Step 4: Simplify right side
    728.12x = 435,290.42
  5. Step 5: Solve for x
    x = 435,290.42/728.12
  6. Step 6: Final answer
    x = 597.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.