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Finding the Fourth Proportional to 1,276.78, 1,915.38 and 627.58

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Solution

The fourth proportional to 1,276.78, 1,915.38 and 627.58 is: 941.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.78 : 1,915.38 = 627.58 : x
  2. Step 2: Convert to fraction form
    1,276.78/1,915.38 = 627.58/x
  3. Step 3: Cross multiply
    1,276.78x = 1,915.38 × 627.58
  4. Step 4: Simplify right side
    1,276.78x = 1,202,054.18
  5. Step 5: Solve for x
    x = 1,202,054.18/1,276.78
  6. Step 6: Final answer
    x = 941.47

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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.