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Finding the Fourth Proportional to 121,405.70, 182,108.55 and 91,881.20

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Solution

The fourth proportional to 121,405.70, 182,108.55 and 91,881.20 is: 137,821.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,405.70 : 182,108.55 = 91,881.20 : x
  2. Step 2: Convert to fraction form
    121,405.70/182,108.55 = 91,881.20/x
  3. Step 3: Cross multiply
    121,405.70x = 182,108.55 × 91,881.20
  4. Step 4: Simplify right side
    121,405.70x = 16,732,352,104.26
  5. Step 5: Solve for x
    x = 16,732,352,104.26/121,405.70
  6. Step 6: Final answer
    x = 137,821.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.