Home / 20,378.24-28,123.13-11,425.31

Finding the Fourth Proportional to 20,378.24, 28,123.13 and 11,425.31

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Solution

The fourth proportional to 20,378.24, 28,123.13 and 11,425.31 is: 15,767.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.24 : 28,123.13 = 11,425.31 : x
  2. Step 2: Convert to fraction form
    20,378.24/28,123.13 = 11,425.31/x
  3. Step 3: Cross multiply
    20,378.24x = 28,123.13 × 11,425.31
  4. Step 4: Simplify right side
    20,378.24x = 321,315,408.11
  5. Step 5: Solve for x
    x = 321,315,408.11/20,378.24
  6. Step 6: Final answer
    x = 15,767.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.