Home / 31,616.29-43,639.56-20,869

Finding the Fourth Proportional to 31,616.29, 43,639.56 and 20,869

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Solution

The fourth proportional to 31,616.29, 43,639.56 and 20,869 is: 28,805.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,616.29 : 43,639.56 = 20,869 : x
  2. Step 2: Convert to fraction form
    31,616.29/43,639.56 = 20,869/x
  3. Step 3: Cross multiply
    31,616.29x = 43,639.56 × 20,869
  4. Step 4: Simplify right side
    31,616.29x = 910,713,977.64
  5. Step 5: Solve for x
    x = 910,713,977.64/31,616.29
  6. Step 6: Final answer
    x = 28,805.22

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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.