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Finding the Fourth Proportional to 868.76, 1,301.70 and 611

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Solution

The fourth proportional to 868.76, 1,301.70 and 611 is: 915.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.76 : 1,301.70 = 611 : x
  2. Step 2: Convert to fraction form
    868.76/1,301.70 = 611/x
  3. Step 3: Cross multiply
    868.76x = 1,301.70 × 611
  4. Step 4: Simplify right side
    868.76x = 795,338.70
  5. Step 5: Solve for x
    x = 795,338.70/868.76
  6. Step 6: Final answer
    x = 915.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.