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Finding the Fourth Proportional to 1,241.50, 1,713.27 and 689.50

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Solution

The fourth proportional to 1,241.50, 1,713.27 and 689.50 is: 951.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.50 : 1,713.27 = 689.50 : x
  2. Step 2: Convert to fraction form
    1,241.50/1,713.27 = 689.50/x
  3. Step 3: Cross multiply
    1,241.50x = 1,713.27 × 689.50
  4. Step 4: Simplify right side
    1,241.50x = 1,181,299.67
  5. Step 5: Solve for x
    x = 1,181,299.67/1,241.50
  6. Step 6: Final answer
    x = 951.51

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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.