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Finding the Fourth Proportional to 3,918, 5,874.96 and 1,320

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Solution

The fourth proportional to 3,918, 5,874.96 and 1,320 is: 1,979.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,918 : 5,874.96 = 1,320 : x
  2. Step 2: Convert to fraction form
    3,918/5,874.96 = 1,320/x
  3. Step 3: Cross multiply
    3,918x = 5,874.96 × 1,320
  4. Step 4: Simplify right side
    3,918x = 7,754,947.20
  5. Step 5: Solve for x
    x = 7,754,947.20/3,918
  6. Step 6: Final answer
    x = 1,979.31

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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.