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Finding the Fourth Proportional to 775.85, 1,070.66 and 426.53

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Solution

The fourth proportional to 775.85, 1,070.66 and 426.53 is: 588.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.85 : 1,070.66 = 426.53 : x
  2. Step 2: Convert to fraction form
    775.85/1,070.66 = 426.53/x
  3. Step 3: Cross multiply
    775.85x = 1,070.66 × 426.53
  4. Step 4: Simplify right side
    775.85x = 456,672.35
  5. Step 5: Solve for x
    x = 456,672.35/775.85
  6. Step 6: Final answer
    x = 588.61

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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.