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Finding the Fourth Proportional to 728.68, 1,005.49 and 433.90

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Solution

The fourth proportional to 728.68, 1,005.49 and 433.90 is: 598.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.68 : 1,005.49 = 433.90 : x
  2. Step 2: Convert to fraction form
    728.68/1,005.49 = 433.90/x
  3. Step 3: Cross multiply
    728.68x = 1,005.49 × 433.90
  4. Step 4: Simplify right side
    728.68x = 436,282.11
  5. Step 5: Solve for x
    x = 436,282.11/728.68
  6. Step 6: Final answer
    x = 598.73

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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.