Home / 13,985.90-20,979.13-5,219.07

Finding the Fourth Proportional to 13,985.90, 20,979.13 and 5,219.07

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Solution

The fourth proportional to 13,985.90, 20,979.13 and 5,219.07 is: 7,828.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,985.90 : 20,979.13 = 5,219.07 : x
  2. Step 2: Convert to fraction form
    13,985.90/20,979.13 = 5,219.07/x
  3. Step 3: Cross multiply
    13,985.90x = 20,979.13 × 5,219.07
  4. Step 4: Simplify right side
    13,985.90x = 109,491,443.11
  5. Step 5: Solve for x
    x = 109,491,443.11/13,985.90
  6. Step 6: Final answer
    x = 7,828.70

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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.