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Finding the Fourth Proportional to 1,277.42, 1,915.17 and 627.50

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Solution

The fourth proportional to 1,277.42, 1,915.17 and 627.50 is: 940.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.42 : 1,915.17 = 627.50 : x
  2. Step 2: Convert to fraction form
    1,277.42/1,915.17 = 627.50/x
  3. Step 3: Cross multiply
    1,277.42x = 1,915.17 × 627.50
  4. Step 4: Simplify right side
    1,277.42x = 1,201,769.18
  5. Step 5: Solve for x
    x = 1,201,769.18/1,277.42
  6. Step 6: Final answer
    x = 940.78

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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.