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Finding the Fourth Proportional to 1,276.74, 1,915.79 and 627.48

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Solution

The fourth proportional to 1,276.74, 1,915.79 and 627.48 is: 941.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.74 : 1,915.79 = 627.48 : x
  2. Step 2: Convert to fraction form
    1,276.74/1,915.79 = 627.48/x
  3. Step 3: Cross multiply
    1,276.74x = 1,915.79 × 627.48
  4. Step 4: Simplify right side
    1,276.74x = 1,202,116.77
  5. Step 5: Solve for x
    x = 1,202,116.77/1,276.74
  6. Step 6: Final answer
    x = 941.55

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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.