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Finding the Fourth Proportional to 1,241.49, 1,712.70 and 717.15

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Solution

The fourth proportional to 1,241.49, 1,712.70 and 717.15 is: 989.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.49 : 1,712.70 = 717.15 : x
  2. Step 2: Convert to fraction form
    1,241.49/1,712.70 = 717.15/x
  3. Step 3: Cross multiply
    1,241.49x = 1,712.70 × 717.15
  4. Step 4: Simplify right side
    1,241.49x = 1,228,262.81
  5. Step 5: Solve for x
    x = 1,228,262.81/1,241.49
  6. Step 6: Final answer
    x = 989.35

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1.5x scale

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.