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Finding the Fourth Proportional to 121,871.70, 182,451.15 and 86,879.70

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Solution

The fourth proportional to 121,871.70, 182,451.15 and 86,879.70 is: 130,065.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,871.70 : 182,451.15 = 86,879.70 : x
  2. Step 2: Convert to fraction form
    121,871.70/182,451.15 = 86,879.70/x
  3. Step 3: Cross multiply
    121,871.70x = 182,451.15 × 86,879.70
  4. Step 4: Simplify right side
    121,871.70x = 15,851,301,176.66
  5. Step 5: Solve for x
    x = 15,851,301,176.66/121,871.70
  6. Step 6: Final answer
    x = 130,065.48

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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.