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Finding the Fourth Proportional to 744.91, 1,029.06 and 615.31

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Solution

The fourth proportional to 744.91, 1,029.06 and 615.31 is: 850.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.91 : 1,029.06 = 615.31 : x
  2. Step 2: Convert to fraction form
    744.91/1,029.06 = 615.31/x
  3. Step 3: Cross multiply
    744.91x = 1,029.06 × 615.31
  4. Step 4: Simplify right side
    744.91x = 633,190.91
  5. Step 5: Solve for x
    x = 633,190.91/744.91
  6. Step 6: Final answer
    x = 850.02

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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.