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Finding the Fourth Proportional to 1,241.28, 1,712.80 and 717.48

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Solution

The fourth proportional to 1,241.28, 1,712.80 and 717.48 is: 990.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,241.28 : 1,712.80 = 717.48 : x
  2. Step 2: Convert to fraction form
    1,241.28/1,712.80 = 717.48/x
  3. Step 3: Cross multiply
    1,241.28x = 1,712.80 × 717.48
  4. Step 4: Simplify right side
    1,241.28x = 1,228,899.74
  5. Step 5: Solve for x
    x = 1,228,899.74/1,241.28
  6. Step 6: Final answer
    x = 990.03

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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.