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Finding the Fourth Proportional to 2,387.68, 3,294.68 and 1,392.88

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Solution

The fourth proportional to 2,387.68, 3,294.68 and 1,392.88 is: 1,921.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,387.68 : 3,294.68 = 1,392.88 : x
  2. Step 2: Convert to fraction form
    2,387.68/3,294.68 = 1,392.88/x
  3. Step 3: Cross multiply
    2,387.68x = 3,294.68 × 1,392.88
  4. Step 4: Simplify right side
    2,387.68x = 4,589,093.88
  5. Step 5: Solve for x
    x = 4,589,093.88/2,387.68
  6. Step 6: Final answer
    x = 1,921.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.