Home / 31,121.78-42,948.09-16,974.86

Finding the Fourth Proportional to 31,121.78, 42,948.09 and 16,974.86

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Solution

The fourth proportional to 31,121.78, 42,948.09 and 16,974.86 is: 23,425.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,121.78 : 42,948.09 = 16,974.86 : x
  2. Step 2: Convert to fraction form
    31,121.78/42,948.09 = 16,974.86/x
  3. Step 3: Cross multiply
    31,121.78x = 42,948.09 × 16,974.86
  4. Step 4: Simplify right side
    31,121.78x = 729,037,600.28
  5. Step 5: Solve for x
    x = 729,037,600.28/31,121.78
  6. Step 6: Final answer
    x = 23,425.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.