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Finding the Fourth Proportional to 7,129.79, 9,838.82 and 3,942.88

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Solution

The fourth proportional to 7,129.79, 9,838.82 and 3,942.88 is: 5,441.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,129.79 : 9,838.82 = 3,942.88 : x
  2. Step 2: Convert to fraction form
    7,129.79/9,838.82 = 3,942.88/x
  3. Step 3: Cross multiply
    7,129.79x = 9,838.82 × 3,942.88
  4. Step 4: Simplify right side
    7,129.79x = 38,793,271.86
  5. Step 5: Solve for x
    x = 38,793,271.86/7,129.79
  6. Step 6: Final answer
    x = 5,441.01

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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.