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Finding the Fourth Proportional to 2,610.75, 3,915.35 and 761.28

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Solution

The fourth proportional to 2,610.75, 3,915.35 and 761.28 is: 1,141.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,610.75 : 3,915.35 = 761.28 : x
  2. Step 2: Convert to fraction form
    2,610.75/3,915.35 = 761.28/x
  3. Step 3: Cross multiply
    2,610.75x = 3,915.35 × 761.28
  4. Step 4: Simplify right side
    2,610.75x = 2,980,681.90
  5. Step 5: Solve for x
    x = 2,980,681.90/2,610.75
  6. Step 6: Final answer
    x = 1,141.70

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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.