Home / 20,819.80-31,246.13-7,681.40

Finding the Fourth Proportional to 20,819.80, 31,246.13 and 7,681.40

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Solution

The fourth proportional to 20,819.80, 31,246.13 and 7,681.40 is: 11,528.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,819.80 : 31,246.13 = 7,681.40 : x
  2. Step 2: Convert to fraction form
    20,819.80/31,246.13 = 7,681.40/x
  3. Step 3: Cross multiply
    20,819.80x = 31,246.13 × 7,681.40
  4. Step 4: Simplify right side
    20,819.80x = 240,014,022.98
  5. Step 5: Solve for x
    x = 240,014,022.98/20,819.80
  6. Step 6: Final answer
    x = 11,528.16

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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.