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Finding the Fourth Proportional to 775.17, 1,069.65 and 425.79

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Solution

The fourth proportional to 775.17, 1,069.65 and 425.79 is: 587.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.17 : 1,069.65 = 425.79 : x
  2. Step 2: Convert to fraction form
    775.17/1,069.65 = 425.79/x
  3. Step 3: Cross multiply
    775.17x = 1,069.65 × 425.79
  4. Step 4: Simplify right side
    775.17x = 455,446.27
  5. Step 5: Solve for x
    x = 455,446.27/775.17
  6. Step 6: Final answer
    x = 587.54

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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.