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Finding the Fourth Proportional to 121,991.70, 182,631.15 and 86,999.70

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Solution

The fourth proportional to 121,991.70, 182,631.15 and 86,999.70 is: 130,245.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,991.70 : 182,631.15 = 86,999.70 : x
  2. Step 2: Convert to fraction form
    121,991.70/182,631.15 = 86,999.70/x
  3. Step 3: Cross multiply
    121,991.70x = 182,631.15 × 86,999.70
  4. Step 4: Simplify right side
    121,991.70x = 15,888,855,260.66
  5. Step 5: Solve for x
    x = 15,888,855,260.66/121,991.70
  6. Step 6: Final answer
    x = 130,245.38

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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.