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Finding the Fourth Proportional to 8,354.80, 12,499.80 and 5,438.80

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Solution

The fourth proportional to 8,354.80, 12,499.80 and 5,438.80 is: 8,137.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,354.80 : 12,499.80 = 5,438.80 : x
  2. Step 2: Convert to fraction form
    8,354.80/12,499.80 = 5,438.80/x
  3. Step 3: Cross multiply
    8,354.80x = 12,499.80 × 5,438.80
  4. Step 4: Simplify right side
    8,354.80x = 67,983,912.24
  5. Step 5: Solve for x
    x = 67,983,912.24/8,354.80
  6. Step 6: Final answer
    x = 8,137.11

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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.