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Finding the Fourth Proportional to 766.56, 1,055.10 and 640.83

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Solution

The fourth proportional to 766.56, 1,055.10 and 640.83 is: 882.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.56 : 1,055.10 = 640.83 : x
  2. Step 2: Convert to fraction form
    766.56/1,055.10 = 640.83/x
  3. Step 3: Cross multiply
    766.56x = 1,055.10 × 640.83
  4. Step 4: Simplify right side
    766.56x = 676,139.73
  5. Step 5: Solve for x
    x = 676,139.73/766.56
  6. Step 6: Final answer
    x = 882.04

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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.