Home / 9,378.62-12,942.01-5,128.86

Finding the Fourth Proportional to 9,378.62, 12,942.01 and 5,128.86

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Solution

The fourth proportional to 9,378.62, 12,942.01 and 5,128.86 is: 7,077.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,378.62 : 12,942.01 = 5,128.86 : x
  2. Step 2: Convert to fraction form
    9,378.62/12,942.01 = 5,128.86/x
  3. Step 3: Cross multiply
    9,378.62x = 12,942.01 × 5,128.86
  4. Step 4: Simplify right side
    9,378.62x = 66,377,692.70
  5. Step 5: Solve for x
    x = 66,377,692.70/9,378.62
  6. Step 6: Final answer
    x = 7,077.55

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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.