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Finding the Fourth Proportional to 28,514.72, 42,756.42 and 8,787.80

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Solution

The fourth proportional to 28,514.72, 42,756.42 and 8,787.80 is: 13,176.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,514.72 : 42,756.42 = 8,787.80 : x
  2. Step 2: Convert to fraction form
    28,514.72/42,756.42 = 8,787.80/x
  3. Step 3: Cross multiply
    28,514.72x = 42,756.42 × 8,787.80
  4. Step 4: Simplify right side
    28,514.72x = 375,734,867.68
  5. Step 5: Solve for x
    x = 375,734,867.68/28,514.72
  6. Step 6: Final answer
    x = 13,176.87

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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.