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Finding the Fourth Proportional to 1,278.48, 1,914.72 and 627.12

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Solution

The fourth proportional to 1,278.48, 1,914.72 and 627.12 is: 939.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.48 : 1,914.72 = 627.12 : x
  2. Step 2: Convert to fraction form
    1,278.48/1,914.72 = 627.12/x
  3. Step 3: Cross multiply
    1,278.48x = 1,914.72 × 627.12
  4. Step 4: Simplify right side
    1,278.48x = 1,200,759.21
  5. Step 5: Solve for x
    x = 1,200,759.21/1,278.48
  6. Step 6: Final answer
    x = 939.21

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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.