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Finding the Fourth Proportional to 80,386.76, 120,585.90 and 21,221.84

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Solution

The fourth proportional to 80,386.76, 120,585.90 and 21,221.84 is: 31,834.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,386.76 : 120,585.90 = 21,221.84 : x
  2. Step 2: Convert to fraction form
    80,386.76/120,585.90 = 21,221.84/x
  3. Step 3: Cross multiply
    80,386.76x = 120,585.90 × 21,221.84
  4. Step 4: Simplify right side
    80,386.76x = 2,559,054,676.06
  5. Step 5: Solve for x
    x = 2,559,054,676.06/80,386.76
  6. Step 6: Final answer
    x = 31,834.28

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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.