Home / 21,405.71-31,953.87-18,781.31

Finding the Fourth Proportional to 21,405.71, 31,953.87 and 18,781.31

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Solution

The fourth proportional to 21,405.71, 31,953.87 and 18,781.31 is: 28,036.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,405.71 : 31,953.87 = 18,781.31 : x
  2. Step 2: Convert to fraction form
    21,405.71/31,953.87 = 18,781.31/x
  3. Step 3: Cross multiply
    21,405.71x = 31,953.87 × 18,781.31
  4. Step 4: Simplify right side
    21,405.71x = 600,135,618.05
  5. Step 5: Solve for x
    x = 600,135,618.05/21,405.71
  6. Step 6: Final answer
    x = 28,036.24

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.