Home / 20,871.72-31,308.66-5,289.48

Finding the Fourth Proportional to 20,871.72, 31,308.66 and 5,289.48

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Solution

The fourth proportional to 20,871.72, 31,308.66 and 5,289.48 is: 7,934.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.72 : 31,308.66 = 5,289.48 : x
  2. Step 2: Convert to fraction form
    20,871.72/31,308.66 = 5,289.48/x
  3. Step 3: Cross multiply
    20,871.72x = 31,308.66 × 5,289.48
  4. Step 4: Simplify right side
    20,871.72x = 165,606,530.90
  5. Step 5: Solve for x
    x = 165,606,530.90/20,871.72
  6. Step 6: Final answer
    x = 7,934.49

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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.