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Finding the Fourth Proportional to 7,040.61, 9,715.89 and 3,896.79

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Solution

The fourth proportional to 7,040.61, 9,715.89 and 3,896.79 is: 5,377.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,040.61 : 9,715.89 = 3,896.79 : x
  2. Step 2: Convert to fraction form
    7,040.61/9,715.89 = 3,896.79/x
  3. Step 3: Cross multiply
    7,040.61x = 9,715.89 × 3,896.79
  4. Step 4: Simplify right side
    7,040.61x = 37,860,782.99
  5. Step 5: Solve for x
    x = 37,860,782.99/7,040.61
  6. Step 6: Final answer
    x = 5,377.49

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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.