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Finding the Fourth Proportional to 221,603.79, 305,812.76 and 121,001.79

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Solution

The fourth proportional to 221,603.79, 305,812.76 and 121,001.79 is: 166,982.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,603.79 : 305,812.76 = 121,001.79 : x
  2. Step 2: Convert to fraction form
    221,603.79/305,812.76 = 121,001.79/x
  3. Step 3: Cross multiply
    221,603.79x = 305,812.76 × 121,001.79
  4. Step 4: Simplify right side
    221,603.79x = 37,003,890,759.83
  5. Step 5: Solve for x
    x = 37,003,890,759.83/221,603.79
  6. Step 6: Final answer
    x = 166,982.21

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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.