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Finding the Fourth Proportional to 121,574.48, 167,861.66 and 78,579.42

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Solution

The fourth proportional to 121,574.48, 167,861.66 and 78,579.42 is: 108,497.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,574.48 : 167,861.66 = 78,579.42 : x
  2. Step 2: Convert to fraction form
    121,574.48/167,861.66 = 78,579.42/x
  3. Step 3: Cross multiply
    121,574.48x = 167,861.66 × 78,579.42
  4. Step 4: Simplify right side
    121,574.48x = 13,190,471,883.04
  5. Step 5: Solve for x
    x = 13,190,471,883.04/121,574.48
  6. Step 6: Final answer
    x = 108,497.05

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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.