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Finding the Fourth Proportional to 7,121.75, 9,828.02 and 3,978.01

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Solution

The fourth proportional to 7,121.75, 9,828.02 and 3,978.01 is: 5,489.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.75 : 9,828.02 = 3,978.01 : x
  2. Step 2: Convert to fraction form
    7,121.75/9,828.02 = 3,978.01/x
  3. Step 3: Cross multiply
    7,121.75x = 9,828.02 × 3,978.01
  4. Step 4: Simplify right side
    7,121.75x = 39,095,892.81
  5. Step 5: Solve for x
    x = 39,095,892.81/7,121.75
  6. Step 6: Final answer
    x = 5,489.65

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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.