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Finding the Fourth Proportional to 739.89, 1,022.90 and 647.55

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Solution

The fourth proportional to 739.89, 1,022.90 and 647.55 is: 895.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.89 : 1,022.90 = 647.55 : x
  2. Step 2: Convert to fraction form
    739.89/1,022.90 = 647.55/x
  3. Step 3: Cross multiply
    739.89x = 1,022.90 × 647.55
  4. Step 4: Simplify right side
    739.89x = 662,375.66
  5. Step 5: Solve for x
    x = 662,375.66/739.89
  6. Step 6: Final answer
    x = 895.24

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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.