Home / 31,871.20-47,828.40-20,750.80

Finding the Fourth Proportional to 31,871.20, 47,828.40 and 20,750.80

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Solution

The fourth proportional to 31,871.20, 47,828.40 and 20,750.80 is: 31,140.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,871.20 : 47,828.40 = 20,750.80 : x
  2. Step 2: Convert to fraction form
    31,871.20/47,828.40 = 20,750.80/x
  3. Step 3: Cross multiply
    31,871.20x = 47,828.40 × 20,750.80
  4. Step 4: Simplify right side
    31,871.20x = 992,477,562.72
  5. Step 5: Solve for x
    x = 992,477,562.72/31,871.20
  6. Step 6: Final answer
    x = 31,140.26

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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.