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Finding the Fourth Proportional to 9,378.78, 12,942.19 and 5,128.99

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Solution

The fourth proportional to 9,378.78, 12,942.19 and 5,128.99 is: 7,077.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.78 : 12,942.19 = 5,128.99 : x
  2. Step 2: Convert to fraction form
    9,378.78/12,942.19 = 5,128.99/x
  3. Step 3: Cross multiply
    9,378.78x = 12,942.19 × 5,128.99
  4. Step 4: Simplify right side
    9,378.78x = 66,380,363.09
  5. Step 5: Solve for x
    x = 66,380,363.09/9,378.78
  6. Step 6: Final answer
    x = 7,077.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.