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Finding the Fourth Proportional to 221,667.28, 305,886.72 and 121,065.28

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Solution

The fourth proportional to 221,667.28, 305,886.72 and 121,065.28 is: 167,062.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,667.28 : 305,886.72 = 121,065.28 : x
  2. Step 2: Convert to fraction form
    221,667.28/305,886.72 = 121,065.28/x
  3. Step 3: Cross multiply
    221,667.28x = 305,886.72 × 121,065.28
  4. Step 4: Simplify right side
    221,667.28x = 37,032,261,405.08
  5. Step 5: Solve for x
    x = 37,032,261,405.08/221,667.28
  6. Step 6: Final answer
    x = 167,062.37

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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.