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Finding the Fourth Proportional to 1,240.70, 1,712.61 and 768.67

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Solution

The fourth proportional to 1,240.70, 1,712.61 and 768.67 is: 1,061.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.70 : 1,712.61 = 768.67 : x
  2. Step 2: Convert to fraction form
    1,240.70/1,712.61 = 768.67/x
  3. Step 3: Cross multiply
    1,240.70x = 1,712.61 × 768.67
  4. Step 4: Simplify right side
    1,240.70x = 1,316,427.65
  5. Step 5: Solve for x
    x = 1,316,427.65/1,240.70
  6. Step 6: Final answer
    x = 1,061.04

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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.