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Finding the Fourth Proportional to 1,277.20, 1,915.20 and 455.23

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Solution

The fourth proportional to 1,277.20, 1,915.20 and 455.23 is: 682.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.20 : 1,915.20 = 455.23 : x
  2. Step 2: Convert to fraction form
    1,277.20/1,915.20 = 455.23/x
  3. Step 3: Cross multiply
    1,277.20x = 1,915.20 × 455.23
  4. Step 4: Simplify right side
    1,277.20x = 871,856.50
  5. Step 5: Solve for x
    x = 871,856.50/1,277.20
  6. Step 6: Final answer
    x = 682.63

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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.