Home / 1,539.28-2,123.87-979.55

Finding the Fourth Proportional to 1,539.28, 2,123.87 and 979.55

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Solution

The fourth proportional to 1,539.28, 2,123.87 and 979.55 is: 1,351.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.28 : 2,123.87 = 979.55 : x
  2. Step 2: Convert to fraction form
    1,539.28/2,123.87 = 979.55/x
  3. Step 3: Cross multiply
    1,539.28x = 2,123.87 × 979.55
  4. Step 4: Simplify right side
    1,539.28x = 2,080,436.86
  5. Step 5: Solve for x
    x = 2,080,436.86/1,539.28
  6. Step 6: Final answer
    x = 1,351.56

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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.