Home / 21,280.47-31,910.03-12,398.67

Finding the Fourth Proportional to 21,280.47, 31,910.03 and 12,398.67

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Solution

The fourth proportional to 21,280.47, 31,910.03 and 12,398.67 is: 18,591.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.47 : 31,910.03 = 12,398.67 : x
  2. Step 2: Convert to fraction form
    21,280.47/31,910.03 = 12,398.67/x
  3. Step 3: Cross multiply
    21,280.47x = 31,910.03 × 12,398.67
  4. Step 4: Simplify right side
    21,280.47x = 395,641,869.67
  5. Step 5: Solve for x
    x = 395,641,869.67/21,280.47
  6. Step 6: Final answer
    x = 18,591.78

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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.