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Finding the Fourth Proportional to 9,879.64, 14,819.90 and 5,493.78

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Solution

The fourth proportional to 9,879.64, 14,819.90 and 5,493.78 is: 8,240.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,879.64 : 14,819.90 = 5,493.78 : x
  2. Step 2: Convert to fraction form
    9,879.64/14,819.90 = 5,493.78/x
  3. Step 3: Cross multiply
    9,879.64x = 14,819.90 × 5,493.78
  4. Step 4: Simplify right side
    9,879.64x = 81,417,242.75
  5. Step 5: Solve for x
    x = 81,417,242.75/9,879.64
  6. Step 6: Final answer
    x = 8,240.91

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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.