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Finding the Fourth Proportional to 1,240.36, 1,711.15 and 768.13

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Solution

The fourth proportional to 1,240.36, 1,711.15 and 768.13 is: 1,059.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.36 : 1,711.15 = 768.13 : x
  2. Step 2: Convert to fraction form
    1,240.36/1,711.15 = 768.13/x
  3. Step 3: Cross multiply
    1,240.36x = 1,711.15 × 768.13
  4. Step 4: Simplify right side
    1,240.36x = 1,314,379.45
  5. Step 5: Solve for x
    x = 1,314,379.45/1,240.36
  6. Step 6: Final answer
    x = 1,059.68

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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.