Home / 20,772.84-31,109.60-11,981.10

Finding the Fourth Proportional to 20,772.84, 31,109.60 and 11,981.10

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Solution

The fourth proportional to 20,772.84, 31,109.60 and 11,981.10 is: 17,943.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,772.84 : 31,109.60 = 11,981.10 : x
  2. Step 2: Convert to fraction form
    20,772.84/31,109.60 = 11,981.10/x
  3. Step 3: Cross multiply
    20,772.84x = 31,109.60 × 11,981.10
  4. Step 4: Simplify right side
    20,772.84x = 372,727,228.56
  5. Step 5: Solve for x
    x = 372,727,228.56/20,772.84
  6. Step 6: Final answer
    x = 17,943.01

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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.