Home / 21,390.56-31,872.64-19,062.80

Finding the Fourth Proportional to 21,390.56, 31,872.64 and 19,062.80

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Solution

The fourth proportional to 21,390.56, 31,872.64 and 19,062.80 is: 28,404.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.56 : 31,872.64 = 19,062.80 : x
  2. Step 2: Convert to fraction form
    21,390.56/31,872.64 = 19,062.80/x
  3. Step 3: Cross multiply
    21,390.56x = 31,872.64 × 19,062.80
  4. Step 4: Simplify right side
    21,390.56x = 607,581,761.79
  5. Step 5: Solve for x
    x = 607,581,761.79/21,390.56
  6. Step 6: Final answer
    x = 28,404.20

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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.