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Finding the Fourth Proportional to 121,808.34, 168,033.96 and 81,523.80

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Solution

The fourth proportional to 121,808.34, 168,033.96 and 81,523.80 is: 112,461.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,808.34 : 168,033.96 = 81,523.80 : x
  2. Step 2: Convert to fraction form
    121,808.34/168,033.96 = 81,523.80/x
  3. Step 3: Cross multiply
    121,808.34x = 168,033.96 × 81,523.80
  4. Step 4: Simplify right side
    121,808.34x = 13,698,766,948.25
  5. Step 5: Solve for x
    x = 13,698,766,948.25/121,808.34
  6. Step 6: Final answer
    x = 112,461.65

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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.