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Finding the Fourth Proportional to 121,572.48, 167,858.90 and 78,577.41

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Solution

The fourth proportional to 121,572.48, 167,858.90 and 78,577.41 is: 108,494.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,572.48 : 167,858.90 = 78,577.41 : x
  2. Step 2: Convert to fraction form
    121,572.48/167,858.90 = 78,577.41/x
  3. Step 3: Cross multiply
    121,572.48x = 167,858.90 × 78,577.41
  4. Step 4: Simplify right side
    121,572.48x = 13,189,917,214.56
  5. Step 5: Solve for x
    x = 13,189,917,214.56/121,572.48
  6. Step 6: Final answer
    x = 108,494.27

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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.