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Finding the Fourth Proportional to 1,277.46, 1,915.76 and 411.57

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Solution

The fourth proportional to 1,277.46, 1,915.76 and 411.57 is: 617.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.46 : 1,915.76 = 411.57 : x
  2. Step 2: Convert to fraction form
    1,277.46/1,915.76 = 411.57/x
  3. Step 3: Cross multiply
    1,277.46x = 1,915.76 × 411.57
  4. Step 4: Simplify right side
    1,277.46x = 788,467.29
  5. Step 5: Solve for x
    x = 788,467.29/1,277.46
  6. Step 6: Final answer
    x = 617.21

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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.