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Finding the Fourth Proportional to 712.90, 1,069.31 and 250.70

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Solution

The fourth proportional to 712.90, 1,069.31 and 250.70 is: 376.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    712.90 : 1,069.31 = 250.70 : x
  2. Step 2: Convert to fraction form
    712.90/1,069.31 = 250.70/x
  3. Step 3: Cross multiply
    712.90x = 1,069.31 × 250.70
  4. Step 4: Simplify right side
    712.90x = 268,076.02
  5. Step 5: Solve for x
    x = 268,076.02/712.90
  6. Step 6: Final answer
    x = 376.04

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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.