Home / 5,278.48-7,909.52-1,989.78

Finding the Fourth Proportional to 5,278.48, 7,909.52 and 1,989.78

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Solution

The fourth proportional to 5,278.48, 7,909.52 and 1,989.78 is: 2,981.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,278.48 : 7,909.52 = 1,989.78 : x
  2. Step 2: Convert to fraction form
    5,278.48/7,909.52 = 1,989.78/x
  3. Step 3: Cross multiply
    5,278.48x = 7,909.52 × 1,989.78
  4. Step 4: Simplify right side
    5,278.48x = 15,738,209.59
  5. Step 5: Solve for x
    x = 15,738,209.59/5,278.48
  6. Step 6: Final answer
    x = 2,981.58

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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.