Home / 31,820.39-43,920.09-18,399.39

Finding the Fourth Proportional to 31,820.39, 43,920.09 and 18,399.39

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Solution

The fourth proportional to 31,820.39, 43,920.09 and 18,399.39 is: 25,395.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,820.39 : 43,920.09 = 18,399.39 : x
  2. Step 2: Convert to fraction form
    31,820.39/43,920.09 = 18,399.39/x
  3. Step 3: Cross multiply
    31,820.39x = 43,920.09 × 18,399.39
  4. Step 4: Simplify right side
    31,820.39x = 808,102,807.71
  5. Step 5: Solve for x
    x = 808,102,807.71/31,820.39
  6. Step 6: Final answer
    x = 25,395.75

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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.