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Finding the Fourth Proportional to 1,240.79, 1,712.64 and 709.97

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Solution

The fourth proportional to 1,240.79, 1,712.64 and 709.97 is: 979.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.79 : 1,712.64 = 709.97 : x
  2. Step 2: Convert to fraction form
    1,240.79/1,712.64 = 709.97/x
  3. Step 3: Cross multiply
    1,240.79x = 1,712.64 × 709.97
  4. Step 4: Simplify right side
    1,240.79x = 1,215,917.12
  5. Step 5: Solve for x
    x = 1,215,917.12/1,240.79
  6. Step 6: Final answer
    x = 979.96

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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.