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Finding the Fourth Proportional to 28,363.20, 42,544.80 and 9,890.88

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Solution

The fourth proportional to 28,363.20, 42,544.80 and 9,890.88 is: 14,836.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,363.20 : 42,544.80 = 9,890.88 : x
  2. Step 2: Convert to fraction form
    28,363.20/42,544.80 = 9,890.88/x
  3. Step 3: Cross multiply
    28,363.20x = 42,544.80 × 9,890.88
  4. Step 4: Simplify right side
    28,363.20x = 420,805,511.42
  5. Step 5: Solve for x
    x = 420,805,511.42/28,363.20
  6. Step 6: Final answer
    x = 14,836.32

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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.