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Finding the Fourth Proportional to 28,007.80, 42,001.92 and 8,281.12

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Solution

The fourth proportional to 28,007.80, 42,001.92 and 8,281.12 is: 12,418.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,007.80 : 42,001.92 = 8,281.12 : x
  2. Step 2: Convert to fraction form
    28,007.80/42,001.92 = 8,281.12/x
  3. Step 3: Cross multiply
    28,007.80x = 42,001.92 × 8,281.12
  4. Step 4: Simplify right side
    28,007.80x = 347,822,939.75
  5. Step 5: Solve for x
    x = 347,822,939.75/28,007.80
  6. Step 6: Final answer
    x = 12,418.79

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1.5x scale

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.