Home / 20,380.24-28,137-13,318.48

Finding the Fourth Proportional to 20,380.24, 28,137 and 13,318.48

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Solution

The fourth proportional to 20,380.24, 28,137 and 13,318.48 is: 18,387.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.24 : 28,137 = 13,318.48 : x
  2. Step 2: Convert to fraction form
    20,380.24/28,137 = 13,318.48/x
  3. Step 3: Cross multiply
    20,380.24x = 28,137 × 13,318.48
  4. Step 4: Simplify right side
    20,380.24x = 374,742,071.76
  5. Step 5: Solve for x
    x = 374,742,071.76/20,380.24
  6. Step 6: Final answer
    x = 18,387.52

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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.