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Finding the Fourth Proportional to 775.34, 1,069.97 and 421.27

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Solution

The fourth proportional to 775.34, 1,069.97 and 421.27 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.34 : 1,069.97 = 421.27 : x
  2. Step 2: Convert to fraction form
    775.34/1,069.97 = 421.27/x
  3. Step 3: Cross multiply
    775.34x = 1,069.97 × 421.27
  4. Step 4: Simplify right side
    775.34x = 450,741.48
  5. Step 5: Solve for x
    x = 450,741.48/775.34
  6. Step 6: Final answer
    x = 581.34

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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.