Home / 20,931.56-28,877.16-13,375.94

Finding the Fourth Proportional to 20,931.56, 28,877.16 and 13,375.94

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Solution

The fourth proportional to 20,931.56, 28,877.16 and 13,375.94 is: 18,453.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.56 : 28,877.16 = 13,375.94 : x
  2. Step 2: Convert to fraction form
    20,931.56/28,877.16 = 13,375.94/x
  3. Step 3: Cross multiply
    20,931.56x = 28,877.16 × 13,375.94
  4. Step 4: Simplify right side
    20,931.56x = 386,259,159.53
  5. Step 5: Solve for x
    x = 386,259,159.53/20,931.56
  6. Step 6: Final answer
    x = 18,453.43

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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.