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Finding the Fourth Proportional to 126,021.80, 188,595.30 and 86,655.80

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Solution

The fourth proportional to 126,021.80, 188,595.30 and 86,655.80 is: 129,682.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    126,021.80 : 188,595.30 = 86,655.80 : x
  2. Step 2: Convert to fraction form
    126,021.80/188,595.30 = 86,655.80/x
  3. Step 3: Cross multiply
    126,021.80x = 188,595.30 × 86,655.80
  4. Step 4: Simplify right side
    126,021.80x = 16,342,876,597.74
  5. Step 5: Solve for x
    x = 16,342,876,597.74/126,021.80
  6. Step 6: Final answer
    x = 129,682.93

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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.