Home / 31,126.78-42,955.11-16,979.63

Finding the Fourth Proportional to 31,126.78, 42,955.11 and 16,979.63

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Solution

The fourth proportional to 31,126.78, 42,955.11 and 16,979.63 is: 23,431.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,126.78 : 42,955.11 = 16,979.63 : x
  2. Step 2: Convert to fraction form
    31,126.78/42,955.11 = 16,979.63/x
  3. Step 3: Cross multiply
    31,126.78x = 42,955.11 × 16,979.63
  4. Step 4: Simplify right side
    31,126.78x = 729,361,659.63
  5. Step 5: Solve for x
    x = 729,361,659.63/31,126.78
  6. Step 6: Final answer
    x = 23,431.97

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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.