Home / 18,721.80-28,120-11,714.24

Finding the Fourth Proportional to 18,721.80, 28,120 and 11,714.24

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Solution

The fourth proportional to 18,721.80, 28,120 and 11,714.24 is: 17,594.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,721.80 : 28,120 = 11,714.24 : x
  2. Step 2: Convert to fraction form
    18,721.80/28,120 = 11,714.24/x
  3. Step 3: Cross multiply
    18,721.80x = 28,120 × 11,714.24
  4. Step 4: Simplify right side
    18,721.80x = 329,404,428.80
  5. Step 5: Solve for x
    x = 329,404,428.80/18,721.80
  6. Step 6: Final answer
    x = 17,594.70

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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.