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Finding the Fourth Proportional to 139,040.20, 208,560.30 and 86,552.20

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Solution

The fourth proportional to 139,040.20, 208,560.30 and 86,552.20 is: 129,828.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,040.20 : 208,560.30 = 86,552.20 : x
  2. Step 2: Convert to fraction form
    139,040.20/208,560.30 = 86,552.20/x
  3. Step 3: Cross multiply
    139,040.20x = 208,560.30 × 86,552.20
  4. Step 4: Simplify right side
    139,040.20x = 18,051,352,797.66
  5. Step 5: Solve for x
    x = 18,051,352,797.66/139,040.20
  6. Step 6: Final answer
    x = 129,828.30

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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.