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Finding the Fourth Proportional to 765.20, 1,055.88 and 450.44

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Solution

The fourth proportional to 765.20, 1,055.88 and 450.44 is: 621.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.20 : 1,055.88 = 450.44 : x
  2. Step 2: Convert to fraction form
    765.20/1,055.88 = 450.44/x
  3. Step 3: Cross multiply
    765.20x = 1,055.88 × 450.44
  4. Step 4: Simplify right side
    765.20x = 475,610.59
  5. Step 5: Solve for x
    x = 475,610.59/765.20
  6. Step 6: Final answer
    x = 621.55

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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.