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Finding the Fourth Proportional to 765.15, 1,055.57 and 449.85

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Solution

The fourth proportional to 765.15, 1,055.57 and 449.85 is: 620.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.15 : 1,055.57 = 449.85 : x
  2. Step 2: Convert to fraction form
    765.15/1,055.57 = 449.85/x
  3. Step 3: Cross multiply
    765.15x = 1,055.57 × 449.85
  4. Step 4: Simplify right side
    765.15x = 474,851.77
  5. Step 5: Solve for x
    x = 474,851.77/765.15
  6. Step 6: Final answer
    x = 620.60

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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.