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Finding the Fourth Proportional to 121,897.96, 168,181.86 and 79,441

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Solution

The fourth proportional to 121,897.96, 168,181.86 and 79,441 is: 109,604.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,897.96 : 168,181.86 = 79,441 : x
  2. Step 2: Convert to fraction form
    121,897.96/168,181.86 = 79,441/x
  3. Step 3: Cross multiply
    121,897.96x = 168,181.86 × 79,441
  4. Step 4: Simplify right side
    121,897.96x = 13,360,535,140.26
  5. Step 5: Solve for x
    x = 13,360,535,140.26/121,897.96
  6. Step 6: Final answer
    x = 109,604.26

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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.