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Finding the Fourth Proportional to 7,122.76, 9,829.15 and 3,935.99

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Solution

The fourth proportional to 7,122.76, 9,829.15 and 3,935.99 is: 5,431.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.76 : 9,829.15 = 3,935.99 : x
  2. Step 2: Convert to fraction form
    7,122.76/9,829.15 = 3,935.99/x
  3. Step 3: Cross multiply
    7,122.76x = 9,829.15 × 3,935.99
  4. Step 4: Simplify right side
    7,122.76x = 38,687,450.84
  5. Step 5: Solve for x
    x = 38,687,450.84/7,122.76
  6. Step 6: Final answer
    x = 5,431.53

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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.