Home / 5,278.95-7,921.71-1,991.61

Finding the Fourth Proportional to 5,278.95, 7,921.71 and 1,991.61

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Solution

The fourth proportional to 5,278.95, 7,921.71 and 1,991.61 is: 2,988.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.95 : 7,921.71 = 1,991.61 : x
  2. Step 2: Convert to fraction form
    5,278.95/7,921.71 = 1,991.61/x
  3. Step 3: Cross multiply
    5,278.95x = 7,921.71 × 1,991.61
  4. Step 4: Simplify right side
    5,278.95x = 15,776,956.85
  5. Step 5: Solve for x
    x = 15,776,956.85/5,278.95
  6. Step 6: Final answer
    x = 2,988.65

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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.