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Finding the Fourth Proportional to 20,928.84, 28,882.03 and 11,368.84

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Solution

The fourth proportional to 20,928.84, 28,882.03 and 11,368.84 is: 15,689.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,928.84 : 28,882.03 = 11,368.84 : x
  2. Step 2: Convert to fraction form
    20,928.84/28,882.03 = 11,368.84/x
  3. Step 3: Cross multiply
    20,928.84x = 28,882.03 × 11,368.84
  4. Step 4: Simplify right side
    20,928.84x = 328,355,290.62
  5. Step 5: Solve for x
    x = 328,355,290.62/20,928.84
  6. Step 6: Final answer
    x = 15,689.13

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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.