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Finding the Fourth Proportional to 1,241, 1,712.60 and 689

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Solution

The fourth proportional to 1,241, 1,712.60 and 689 is: 950.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241 : 1,712.60 = 689 : x
  2. Step 2: Convert to fraction form
    1,241/1,712.60 = 689/x
  3. Step 3: Cross multiply
    1,241x = 1,712.60 × 689
  4. Step 4: Simplify right side
    1,241x = 1,179,981.40
  5. Step 5: Solve for x
    x = 1,179,981.40/1,241
  6. Step 6: Final answer
    x = 950.83

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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.