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Finding the Fourth Proportional to 121,612.60, 182,030.10 and 86,620.60

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Solution

The fourth proportional to 121,612.60, 182,030.10 and 86,620.60 is: 129,653.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,612.60 : 182,030.10 = 86,620.60 : x
  2. Step 2: Convert to fraction form
    121,612.60/182,030.10 = 86,620.60/x
  3. Step 3: Cross multiply
    121,612.60x = 182,030.10 × 86,620.60
  4. Step 4: Simplify right side
    121,612.60x = 15,767,556,480.06
  5. Step 5: Solve for x
    x = 15,767,556,480.06/121,612.60
  6. Step 6: Final answer
    x = 129,653.97

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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.