Home / 31,721.16-43,772.21-18,971.71

Finding the Fourth Proportional to 31,721.16, 43,772.21 and 18,971.71

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Solution

The fourth proportional to 31,721.16, 43,772.21 and 18,971.71 is: 26,179.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,721.16 : 43,772.21 = 18,971.71 : x
  2. Step 2: Convert to fraction form
    31,721.16/43,772.21 = 18,971.71/x
  3. Step 3: Cross multiply
    31,721.16x = 43,772.21 × 18,971.71
  4. Step 4: Simplify right side
    31,721.16x = 830,433,674.18
  5. Step 5: Solve for x
    x = 830,433,674.18/31,721.16
  6. Step 6: Final answer
    x = 26,179.17

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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.