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Finding the Fourth Proportional to 205,655.40, 308,288.70 and 121,480.20

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Solution

The fourth proportional to 205,655.40, 308,288.70 and 121,480.20 is: 182,105.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,655.40 : 308,288.70 = 121,480.20 : x
  2. Step 2: Convert to fraction form
    205,655.40/308,288.70 = 121,480.20/x
  3. Step 3: Cross multiply
    205,655.40x = 308,288.70 × 121,480.20
  4. Step 4: Simplify right side
    205,655.40x = 37,450,972,933.74
  5. Step 5: Solve for x
    x = 37,450,972,933.74/205,655.40
  6. Step 6: Final answer
    x = 182,105.47

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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.