Home / 21,268.56-31,902.96-18,939.36

Finding the Fourth Proportional to 21,268.56, 31,902.96 and 18,939.36

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Solution

The fourth proportional to 21,268.56, 31,902.96 and 18,939.36 is: 28,409.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,268.56 : 31,902.96 = 18,939.36 : x
  2. Step 2: Convert to fraction form
    21,268.56/31,902.96 = 18,939.36/x
  3. Step 3: Cross multiply
    21,268.56x = 31,902.96 × 18,939.36
  4. Step 4: Simplify right side
    21,268.56x = 604,221,644.51
  5. Step 5: Solve for x
    x = 604,221,644.51/21,268.56
  6. Step 6: Final answer
    x = 28,409.15

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.