Home / 13,979.76-20,955.96-5,209.88

Finding the Fourth Proportional to 13,979.76, 20,955.96 and 5,209.88

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Solution

The fourth proportional to 13,979.76, 20,955.96 and 5,209.88 is: 7,809.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.76 : 20,955.96 = 5,209.88 : x
  2. Step 2: Convert to fraction form
    13,979.76/20,955.96 = 5,209.88/x
  3. Step 3: Cross multiply
    13,979.76x = 20,955.96 × 5,209.88
  4. Step 4: Simplify right side
    13,979.76x = 109,178,036.88
  5. Step 5: Solve for x
    x = 109,178,036.88/13,979.76
  6. Step 6: Final answer
    x = 7,809.72

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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.