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Finding the Fourth Proportional to 775.92, 1,070.80 and 426.64

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Solution

The fourth proportional to 775.92, 1,070.80 and 426.64 is: 588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.92 : 1,070.80 = 426.64 : x
  2. Step 2: Convert to fraction form
    775.92/1,070.80 = 426.64/x
  3. Step 3: Cross multiply
    775.92x = 1,070.80 × 426.64
  4. Step 4: Simplify right side
    775.92x = 456,846.11
  5. Step 5: Solve for x
    x = 456,846.11/775.92
  6. Step 6: Final answer
    x = 588.78

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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.