Home / 4,747.12-7,120.72-4,390

Finding the Fourth Proportional to 4,747.12, 7,120.72 and 4,390

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Solution

The fourth proportional to 4,747.12, 7,120.72 and 4,390 is: 6,585.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,747.12 : 7,120.72 = 4,390 : x
  2. Step 2: Convert to fraction form
    4,747.12/7,120.72 = 4,390/x
  3. Step 3: Cross multiply
    4,747.12x = 7,120.72 × 4,390
  4. Step 4: Simplify right side
    4,747.12x = 31,259,960.80
  5. Step 5: Solve for x
    x = 31,259,960.80/4,747.12
  6. Step 6: Final answer
    x = 6,585.04

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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.