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Finding the Fourth Proportional to 775.73, 1,070.37 and 628.11

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Solution

The fourth proportional to 775.73, 1,070.37 and 628.11 is: 866.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.73 : 1,070.37 = 628.11 : x
  2. Step 2: Convert to fraction form
    775.73/1,070.37 = 628.11/x
  3. Step 3: Cross multiply
    775.73x = 1,070.37 × 628.11
  4. Step 4: Simplify right side
    775.73x = 672,310.10
  5. Step 5: Solve for x
    x = 672,310.10/775.73
  6. Step 6: Final answer
    x = 866.68

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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.