Home / 21,279.60-31,880.52-15,421.68

Finding the Fourth Proportional to 21,279.60, 31,880.52 and 15,421.68

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Solution

The fourth proportional to 21,279.60, 31,880.52 and 15,421.68 is: 23,104.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.60 : 31,880.52 = 15,421.68 : x
  2. Step 2: Convert to fraction form
    21,279.60/31,880.52 = 15,421.68/x
  3. Step 3: Cross multiply
    21,279.60x = 31,880.52 × 15,421.68
  4. Step 4: Simplify right side
    21,279.60x = 491,651,177.67
  5. Step 5: Solve for x
    x = 491,651,177.67/21,279.60
  6. Step 6: Final answer
    x = 23,104.34

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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.