Home / 21,280.28-31,909.73-12,398.54

Finding the Fourth Proportional to 21,280.28, 31,909.73 and 12,398.54

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Solution

The fourth proportional to 21,280.28, 31,909.73 and 12,398.54 is: 18,591.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.28 : 31,909.73 = 12,398.54 : x
  2. Step 2: Convert to fraction form
    21,280.28/31,909.73 = 12,398.54/x
  3. Step 3: Cross multiply
    21,280.28x = 31,909.73 × 12,398.54
  4. Step 4: Simplify right side
    21,280.28x = 395,633,842.25
  5. Step 5: Solve for x
    x = 395,633,842.25/21,280.28
  6. Step 6: Final answer
    x = 18,591.58

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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.