Home / 31,391.28-47,077.20-13,875.84

Finding the Fourth Proportional to 31,391.28, 47,077.20 and 13,875.84

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Solution

The fourth proportional to 31,391.28, 47,077.20 and 13,875.84 is: 20,809.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,391.28 : 47,077.20 = 13,875.84 : x
  2. Step 2: Convert to fraction form
    31,391.28/47,077.20 = 13,875.84/x
  3. Step 3: Cross multiply
    31,391.28x = 47,077.20 × 13,875.84
  4. Step 4: Simplify right side
    31,391.28x = 653,235,694.85
  5. Step 5: Solve for x
    x = 653,235,694.85/31,391.28
  6. Step 6: Final answer
    x = 20,809.46

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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.