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Finding the Fourth Proportional to 121,990.20, 182,628.90 and 86,998.20

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Solution

The fourth proportional to 121,990.20, 182,628.90 and 86,998.20 is: 130,243.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,990.20 : 182,628.90 = 86,998.20 : x
  2. Step 2: Convert to fraction form
    121,990.20/182,628.90 = 86,998.20/x
  3. Step 3: Cross multiply
    121,990.20x = 182,628.90 × 86,998.20
  4. Step 4: Simplify right side
    121,990.20x = 15,888,385,567.98
  5. Step 5: Solve for x
    x = 15,888,385,567.98/121,990.20
  6. Step 6: Final answer
    x = 130,243.13

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1.5x scale

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.