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Finding the Fourth Proportional to 7,039.88, 9,715.02 and 3,896.28

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Solution

The fourth proportional to 7,039.88, 9,715.02 and 3,896.28 is: 5,376.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,039.88 : 9,715.02 = 3,896.28 : x
  2. Step 2: Convert to fraction form
    7,039.88/9,715.02 = 3,896.28/x
  3. Step 3: Cross multiply
    7,039.88x = 9,715.02 × 3,896.28
  4. Step 4: Simplify right side
    7,039.88x = 37,852,438.13
  5. Step 5: Solve for x
    x = 37,852,438.13/7,039.88
  6. Step 6: Final answer
    x = 5,376.86

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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.