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Finding the Fourth Proportional to 81,291.62, 121,926.65 and 36,908.17

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Solution

The fourth proportional to 81,291.62, 121,926.65 and 36,908.17 is: 55,357.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,291.62 : 121,926.65 = 36,908.17 : x
  2. Step 2: Convert to fraction form
    81,291.62/121,926.65 = 36,908.17/x
  3. Step 3: Cross multiply
    81,291.62x = 121,926.65 × 36,908.17
  4. Step 4: Simplify right side
    81,291.62x = 4,500,089,036.37
  5. Step 5: Solve for x
    x = 4,500,089,036.37/81,291.62
  6. Step 6: Final answer
    x = 55,357.35

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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.