Home / 21,281.47-31,911.53-12,399.67

Finding the Fourth Proportional to 21,281.47, 31,911.53 and 12,399.67

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Solution

The fourth proportional to 21,281.47, 31,911.53 and 12,399.67 is: 18,593.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,281.47 : 31,911.53 = 12,399.67 : x
  2. Step 2: Convert to fraction form
    21,281.47/31,911.53 = 12,399.67/x
  3. Step 3: Cross multiply
    21,281.47x = 31,911.53 × 12,399.67
  4. Step 4: Simplify right side
    21,281.47x = 395,692,379.20
  5. Step 5: Solve for x
    x = 395,692,379.20/21,281.47
  6. Step 6: Final answer
    x = 18,593.28

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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.