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Finding the Fourth Proportional to 5,278.32, 7,918.65 and 1,991.43

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Solution

The fourth proportional to 5,278.32, 7,918.65 and 1,991.43 is: 2,987.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.32 : 7,918.65 = 1,991.43 : x
  2. Step 2: Convert to fraction form
    5,278.32/7,918.65 = 1,991.43/x
  3. Step 3: Cross multiply
    5,278.32x = 7,918.65 × 1,991.43
  4. Step 4: Simplify right side
    5,278.32x = 15,769,437.17
  5. Step 5: Solve for x
    x = 15,769,437.17/5,278.32
  6. Step 6: Final answer
    x = 2,987.59

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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.