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Finding the Fourth Proportional to 6,921.99, 9,553.17 and 3,897.21

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Solution

The fourth proportional to 6,921.99, 9,553.17 and 3,897.21 is: 5,378.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,921.99 : 9,553.17 = 3,897.21 : x
  2. Step 2: Convert to fraction form
    6,921.99/9,553.17 = 3,897.21/x
  3. Step 3: Cross multiply
    6,921.99x = 9,553.17 × 3,897.21
  4. Step 4: Simplify right side
    6,921.99x = 37,230,666.76
  5. Step 5: Solve for x
    x = 37,230,666.76/6,921.99
  6. Step 6: Final answer
    x = 5,378.61

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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.