Home / 20,897.78-31,351.74-12,018.80

Finding the Fourth Proportional to 20,897.78, 31,351.74 and 12,018.80

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Solution

The fourth proportional to 20,897.78, 31,351.74 and 12,018.80 is: 18,031.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,897.78 : 31,351.74 = 12,018.80 : x
  2. Step 2: Convert to fraction form
    20,897.78/31,351.74 = 12,018.80/x
  3. Step 3: Cross multiply
    20,897.78x = 31,351.74 × 12,018.80
  4. Step 4: Simplify right side
    20,897.78x = 376,810,105.91
  5. Step 5: Solve for x
    x = 376,810,105.91/20,897.78
  6. Step 6: Final answer
    x = 18,031.10

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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.