Home / 80,298.40-120,438.28-21,138.68

Finding the Fourth Proportional to 80,298.40, 120,438.28 and 21,138.68

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Solution

The fourth proportional to 80,298.40, 120,438.28 and 21,138.68 is: 31,705.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,298.40 : 120,438.28 = 21,138.68 : x
  2. Step 2: Convert to fraction form
    80,298.40/120,438.28 = 21,138.68/x
  3. Step 3: Cross multiply
    80,298.40x = 120,438.28 × 21,138.68
  4. Step 4: Simplify right side
    80,298.40x = 2,545,906,588.19
  5. Step 5: Solve for x
    x = 2,545,906,588.19/80,298.40
  6. Step 6: Final answer
    x = 31,705.57

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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.