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Finding the Fourth Proportional to 775.40, 1,162.20 and 500.90

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Solution

The fourth proportional to 775.40, 1,162.20 and 500.90 is: 750.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.40 : 1,162.20 = 500.90 : x
  2. Step 2: Convert to fraction form
    775.40/1,162.20 = 500.90/x
  3. Step 3: Cross multiply
    775.40x = 1,162.20 × 500.90
  4. Step 4: Simplify right side
    775.40x = 582,145.98
  5. Step 5: Solve for x
    x = 582,145.98/775.40
  6. Step 6: Final answer
    x = 750.77

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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.