Home / 20,871.84-31,305.24-5,289.60

Finding the Fourth Proportional to 20,871.84, 31,305.24 and 5,289.60

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Solution

The fourth proportional to 20,871.84, 31,305.24 and 5,289.60 is: 7,933.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.84 : 31,305.24 = 5,289.60 : x
  2. Step 2: Convert to fraction form
    20,871.84/31,305.24 = 5,289.60/x
  3. Step 3: Cross multiply
    20,871.84x = 31,305.24 × 5,289.60
  4. Step 4: Simplify right side
    20,871.84x = 165,592,197.50
  5. Step 5: Solve for x
    x = 165,592,197.50/20,871.84
  6. Step 6: Final answer
    x = 7,933.76

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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.