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Finding the Fourth Proportional to 1,275.92, 1,912.95 and 627.11

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Solution

The fourth proportional to 1,275.92, 1,912.95 and 627.11 is: 940.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,275.92 : 1,912.95 = 627.11 : x
  2. Step 2: Convert to fraction form
    1,275.92/1,912.95 = 627.11/x
  3. Step 3: Cross multiply
    1,275.92x = 1,912.95 × 627.11
  4. Step 4: Simplify right side
    1,275.92x = 1,199,630.07
  5. Step 5: Solve for x
    x = 1,199,630.07/1,275.92
  6. Step 6: Final answer
    x = 940.21

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1.5x scale

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.