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Finding the Fourth Proportional to 775.90, 1,162.65 and 672.70

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Solution

The fourth proportional to 775.90, 1,162.65 and 672.70 is: 1,008.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.90 : 1,162.65 = 672.70 : x
  2. Step 2: Convert to fraction form
    775.90/1,162.65 = 672.70/x
  3. Step 3: Cross multiply
    775.90x = 1,162.65 × 672.70
  4. Step 4: Simplify right side
    775.90x = 782,114.66
  5. Step 5: Solve for x
    x = 782,114.66/775.90
  6. Step 6: Final answer
    x = 1,008.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.