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Finding the Fourth Proportional to 1,915.24, 2,872.73 and 682.51

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Solution

The fourth proportional to 1,915.24, 2,872.73 and 682.51 is: 1,023.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,915.24 : 2,872.73 = 682.51 : x
  2. Step 2: Convert to fraction form
    1,915.24/2,872.73 = 682.51/x
  3. Step 3: Cross multiply
    1,915.24x = 2,872.73 × 682.51
  4. Step 4: Simplify right side
    1,915.24x = 1,960,663.54
  5. Step 5: Solve for x
    x = 1,960,663.54/1,915.24
  6. Step 6: Final answer
    x = 1,023.72

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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.