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Finding the Fourth Proportional to 13,888.89, 20,813.90 and 9,974.97

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Solution

The fourth proportional to 13,888.89, 20,813.90 and 9,974.97 is: 14,948.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,888.89 : 20,813.90 = 9,974.97 : x
  2. Step 2: Convert to fraction form
    13,888.89/20,813.90 = 9,974.97/x
  3. Step 3: Cross multiply
    13,888.89x = 20,813.90 × 9,974.97
  4. Step 4: Simplify right side
    13,888.89x = 207,617,978.21
  5. Step 5: Solve for x
    x = 207,617,978.21/13,888.89
  6. Step 6: Final answer
    x = 14,948.49

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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.