Home / 7,129.40-9,838.20-3,942.56

Finding the Fourth Proportional to 7,129.40, 9,838.20 and 3,942.56

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Solution

The fourth proportional to 7,129.40, 9,838.20 and 3,942.56 is: 5,440.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.40 : 9,838.20 = 3,942.56 : x
  2. Step 2: Convert to fraction form
    7,129.40/9,838.20 = 3,942.56/x
  3. Step 3: Cross multiply
    7,129.40x = 9,838.20 × 3,942.56
  4. Step 4: Simplify right side
    7,129.40x = 38,787,693.79
  5. Step 5: Solve for x
    x = 38,787,693.79/7,129.40
  6. Step 6: Final answer
    x = 5,440.53

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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.