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Finding the Fourth Proportional to 744.12, 1,026.41 and 449.28

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Solution

The fourth proportional to 744.12, 1,026.41 and 449.28 is: 619.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.12 : 1,026.41 = 449.28 : x
  2. Step 2: Convert to fraction form
    744.12/1,026.41 = 449.28/x
  3. Step 3: Cross multiply
    744.12x = 1,026.41 × 449.28
  4. Step 4: Simplify right side
    744.12x = 461,143.24
  5. Step 5: Solve for x
    x = 461,143.24/744.12
  6. Step 6: Final answer
    x = 619.72

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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.