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Finding the Fourth Proportional to 775.75, 1,070.60 and 426.51

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Solution

The fourth proportional to 775.75, 1,070.60 and 426.51 is: 588.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.75 : 1,070.60 = 426.51 : x
  2. Step 2: Convert to fraction form
    775.75/1,070.60 = 426.51/x
  3. Step 3: Cross multiply
    775.75x = 1,070.60 × 426.51
  4. Step 4: Simplify right side
    775.75x = 456,621.61
  5. Step 5: Solve for x
    x = 456,621.61/775.75
  6. Step 6: Final answer
    x = 588.62

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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.