Home / 20,438.40-28,193.44-12,871.71

Finding the Fourth Proportional to 20,438.40, 28,193.44 and 12,871.71

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Solution

The fourth proportional to 20,438.40, 28,193.44 and 12,871.71 is: 17,755.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,438.40 : 28,193.44 = 12,871.71 : x
  2. Step 2: Convert to fraction form
    20,438.40/28,193.44 = 12,871.71/x
  3. Step 3: Cross multiply
    20,438.40x = 28,193.44 × 12,871.71
  4. Step 4: Simplify right side
    20,438.40x = 362,897,857.13
  5. Step 5: Solve for x
    x = 362,897,857.13/20,438.40
  6. Step 6: Final answer
    x = 17,755.69

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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.