Home / 21,018.16-31,498.44-20,387.44

Finding the Fourth Proportional to 21,018.16, 31,498.44 and 20,387.44

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Solution

The fourth proportional to 21,018.16, 31,498.44 and 20,387.44 is: 30,553.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,018.16 : 31,498.44 = 20,387.44 : x
  2. Step 2: Convert to fraction form
    21,018.16/31,498.44 = 20,387.44/x
  3. Step 3: Cross multiply
    21,018.16x = 31,498.44 × 20,387.44
  4. Step 4: Simplify right side
    21,018.16x = 642,172,555.59
  5. Step 5: Solve for x
    x = 642,172,555.59/21,018.16
  6. Step 6: Final answer
    x = 30,553.22

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1.5x scale

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.