Home / 20,438.30-28,215.06-13,375.51

Finding the Fourth Proportional to 20,438.30, 28,215.06 and 13,375.51

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Solution

The fourth proportional to 20,438.30, 28,215.06 and 13,375.51 is: 18,464.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.30 : 28,215.06 = 13,375.51 : x
  2. Step 2: Convert to fraction form
    20,438.30/28,215.06 = 13,375.51/x
  3. Step 3: Cross multiply
    20,438.30x = 28,215.06 × 13,375.51
  4. Step 4: Simplify right side
    20,438.30x = 377,390,817.18
  5. Step 5: Solve for x
    x = 377,390,817.18/20,438.30
  6. Step 6: Final answer
    x = 18,464.88

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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.