Home / 21,280.62-31,871.71-20,542.51

Finding the Fourth Proportional to 21,280.62, 31,871.71 and 20,542.51

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Solution

The fourth proportional to 21,280.62, 31,871.71 and 20,542.51 is: 30,766.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,280.62 : 31,871.71 = 20,542.51 : x
  2. Step 2: Convert to fraction form
    21,280.62/31,871.71 = 20,542.51/x
  3. Step 3: Cross multiply
    21,280.62x = 31,871.71 × 20,542.51
  4. Step 4: Simplify right side
    21,280.62x = 654,724,986.91
  5. Step 5: Solve for x
    x = 654,724,986.91/21,280.62
  6. Step 6: Final answer
    x = 30,766.25

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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.