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Finding the Fourth Proportional to 1,276.91, 1,915.12 and 455.21

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Solution

The fourth proportional to 1,276.91, 1,915.12 and 455.21 is: 682.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.91 : 1,915.12 = 455.21 : x
  2. Step 2: Convert to fraction form
    1,276.91/1,915.12 = 455.21/x
  3. Step 3: Cross multiply
    1,276.91x = 1,915.12 × 455.21
  4. Step 4: Simplify right side
    1,276.91x = 871,781.78
  5. Step 5: Solve for x
    x = 871,781.78/1,276.91
  6. Step 6: Final answer
    x = 682.73

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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.