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Finding the Fourth Proportional to 28,479.20, 42,719.48 and 8,757.94

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Solution

The fourth proportional to 28,479.20, 42,719.48 and 8,757.94 is: 13,137.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,479.20 : 42,719.48 = 8,757.94 : x
  2. Step 2: Convert to fraction form
    28,479.20/42,719.48 = 8,757.94/x
  3. Step 3: Cross multiply
    28,479.20x = 42,719.48 × 8,757.94
  4. Step 4: Simplify right side
    28,479.20x = 374,134,642.67
  5. Step 5: Solve for x
    x = 374,134,642.67/28,479.20
  6. Step 6: Final answer
    x = 13,137.12

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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.