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Finding the Fourth Proportional to 1,724.38, 2,379.56 and 938.40

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Solution

The fourth proportional to 1,724.38, 2,379.56 and 938.40 is: 1,294.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,724.38 : 2,379.56 = 938.40 : x
  2. Step 2: Convert to fraction form
    1,724.38/2,379.56 = 938.40/x
  3. Step 3: Cross multiply
    1,724.38x = 2,379.56 × 938.40
  4. Step 4: Simplify right side
    1,724.38x = 2,232,979.10
  5. Step 5: Solve for x
    x = 2,232,979.10/1,724.38
  6. Step 6: Final answer
    x = 1,294.95

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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.