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Finding the Fourth Proportional to 121,784.49, 168,044.63 and 71,499.69

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Solution

The fourth proportional to 121,784.49, 168,044.63 and 71,499.69 is: 98,659.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,784.49 : 168,044.63 = 71,499.69 : x
  2. Step 2: Convert to fraction form
    121,784.49/168,044.63 = 71,499.69/x
  3. Step 3: Cross multiply
    121,784.49x = 168,044.63 × 71,499.69
  4. Step 4: Simplify right side
    121,784.49x = 12,015,138,593.67
  5. Step 5: Solve for x
    x = 12,015,138,593.67/121,784.49
  6. Step 6: Final answer
    x = 98,659.02

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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.