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Finding the Fourth Proportional to 765.67, 1,055.42 and 641.11

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Solution

The fourth proportional to 765.67, 1,055.42 and 641.11 is: 883.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.67 : 1,055.42 = 641.11 : x
  2. Step 2: Convert to fraction form
    765.67/1,055.42 = 641.11/x
  3. Step 3: Cross multiply
    765.67x = 1,055.42 × 641.11
  4. Step 4: Simplify right side
    765.67x = 676,635.04
  5. Step 5: Solve for x
    x = 676,635.04/765.67
  6. Step 6: Final answer
    x = 883.72

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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.