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Finding the Fourth Proportional to 223,809.78, 308,856.60 and 121,840.90

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Solution

The fourth proportional to 223,809.78, 308,856.60 and 121,840.90 is: 168,139.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    223,809.78 : 308,856.60 = 121,840.90 : x
  2. Step 2: Convert to fraction form
    223,809.78/308,856.60 = 121,840.90/x
  3. Step 3: Cross multiply
    223,809.78x = 308,856.60 × 121,840.90
  4. Step 4: Simplify right side
    223,809.78x = 37,631,366,114.94
  5. Step 5: Solve for x
    x = 37,631,366,114.94/223,809.78
  6. Step 6: Final answer
    x = 168,139.95

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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.