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Finding the Fourth Proportional to 2,610.40, 3,915.46 and 761.46

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Solution

The fourth proportional to 2,610.40, 3,915.46 and 761.46 is: 1,142.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,610.40 : 3,915.46 = 761.46 : x
  2. Step 2: Convert to fraction form
    2,610.40/3,915.46 = 761.46/x
  3. Step 3: Cross multiply
    2,610.40x = 3,915.46 × 761.46
  4. Step 4: Simplify right side
    2,610.40x = 2,981,466.17
  5. Step 5: Solve for x
    x = 2,981,466.17/2,610.40
  6. Step 6: Final answer
    x = 1,142.15

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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.