Home / 20,809.78-28,720.14-11,860.50

Finding the Fourth Proportional to 20,809.78, 28,720.14 and 11,860.50

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Solution

The fourth proportional to 20,809.78, 28,720.14 and 11,860.50 is: 16,369.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.78 : 28,720.14 = 11,860.50 : x
  2. Step 2: Convert to fraction form
    20,809.78/28,720.14 = 11,860.50/x
  3. Step 3: Cross multiply
    20,809.78x = 28,720.14 × 11,860.50
  4. Step 4: Simplify right side
    20,809.78x = 340,635,220.47
  5. Step 5: Solve for x
    x = 340,635,220.47/20,809.78
  6. Step 6: Final answer
    x = 16,369.00

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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.