Home / 21,281.76-31,911.96-12,400.02

Finding the Fourth Proportional to 21,281.76, 31,911.96 and 12,400.02

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Solution

The fourth proportional to 21,281.76, 31,911.96 and 12,400.02 is: 18,593.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.76 : 31,911.96 = 12,400.02 : x
  2. Step 2: Convert to fraction form
    21,281.76/31,911.96 = 12,400.02/x
  3. Step 3: Cross multiply
    21,281.76x = 31,911.96 × 12,400.02
  4. Step 4: Simplify right side
    21,281.76x = 395,708,942.24
  5. Step 5: Solve for x
    x = 395,708,942.24/21,281.76
  6. Step 6: Final answer
    x = 18,593.81

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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.