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Finding the Fourth Proportional to 13,239.78, 19,868.04 and 7,400.22

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Solution

The fourth proportional to 13,239.78, 19,868.04 and 7,400.22 is: 11,105.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,239.78 : 19,868.04 = 7,400.22 : x
  2. Step 2: Convert to fraction form
    13,239.78/19,868.04 = 7,400.22/x
  3. Step 3: Cross multiply
    13,239.78x = 19,868.04 × 7,400.22
  4. Step 4: Simplify right side
    13,239.78x = 147,027,866.97
  5. Step 5: Solve for x
    x = 147,027,866.97/13,239.78
  6. Step 6: Final answer
    x = 11,105.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.