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Finding the Fourth Proportional to 121,809.34, 168,035.34 and 81,524.80

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Solution

The fourth proportional to 121,809.34, 168,035.34 and 81,524.80 is: 112,463.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,809.34 : 168,035.34 = 81,524.80 : x
  2. Step 2: Convert to fraction form
    121,809.34/168,035.34 = 81,524.80/x
  3. Step 3: Cross multiply
    121,809.34x = 168,035.34 × 81,524.80
  4. Step 4: Simplify right side
    121,809.34x = 13,699,047,486.43
  5. Step 5: Solve for x
    x = 13,699,047,486.43/121,809.34
  6. Step 6: Final answer
    x = 112,463.03

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1.5x scale

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.