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Finding the Fourth Proportional to 121,641.20, 182,461.80 and 99,771.20

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Solution

The fourth proportional to 121,641.20, 182,461.80 and 99,771.20 is: 149,656.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,641.20 : 182,461.80 = 99,771.20 : x
  2. Step 2: Convert to fraction form
    121,641.20/182,461.80 = 99,771.20/x
  3. Step 3: Cross multiply
    121,641.20x = 182,461.80 × 99,771.20
  4. Step 4: Simplify right side
    121,641.20x = 18,204,432,740.16
  5. Step 5: Solve for x
    x = 18,204,432,740.16/121,641.20
  6. Step 6: Final answer
    x = 149,656.80

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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.