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Finding the Fourth Proportional to 28,311.78, 42,467.76 and 8,590.51

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Solution

The fourth proportional to 28,311.78, 42,467.76 and 8,590.51 is: 12,885.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,311.78 : 42,467.76 = 8,590.51 : x
  2. Step 2: Convert to fraction form
    28,311.78/42,467.76 = 8,590.51/x
  3. Step 3: Cross multiply
    28,311.78x = 42,467.76 × 8,590.51
  4. Step 4: Simplify right side
    28,311.78x = 364,819,716.96
  5. Step 5: Solve for x
    x = 364,819,716.96/28,311.78
  6. Step 6: Final answer
    x = 12,885.79

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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.