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Finding the Fourth Proportional to 712.96, 1,069.72 and 280.24

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Solution

The fourth proportional to 712.96, 1,069.72 and 280.24 is: 420.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.96 : 1,069.72 = 280.24 : x
  2. Step 2: Convert to fraction form
    712.96/1,069.72 = 280.24/x
  3. Step 3: Cross multiply
    712.96x = 1,069.72 × 280.24
  4. Step 4: Simplify right side
    712.96x = 299,778.33
  5. Step 5: Solve for x
    x = 299,778.33/712.96
  6. Step 6: Final answer
    x = 420.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.