Home / 20,885.18-31,356.94-13,886.78

Finding the Fourth Proportional to 20,885.18, 31,356.94 and 13,886.78

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Solution

The fourth proportional to 20,885.18, 31,356.94 and 13,886.78 is: 20,849.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.18 : 31,356.94 = 13,886.78 : x
  2. Step 2: Convert to fraction form
    20,885.18/31,356.94 = 13,886.78/x
  3. Step 3: Cross multiply
    20,885.18x = 31,356.94 × 13,886.78
  4. Step 4: Simplify right side
    20,885.18x = 435,446,927.25
  5. Step 5: Solve for x
    x = 435,446,927.25/20,885.18
  6. Step 6: Final answer
    x = 20,849.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.