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Finding the Fourth Proportional to 18,364.50, 25,343.21 and 9,981

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Solution

The fourth proportional to 18,364.50, 25,343.21 and 9,981 is: 13,773.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,364.50 : 25,343.21 = 9,981 : x
  2. Step 2: Convert to fraction form
    18,364.50/25,343.21 = 9,981/x
  3. Step 3: Cross multiply
    18,364.50x = 25,343.21 × 9,981
  4. Step 4: Simplify right side
    18,364.50x = 252,950,603.96
  5. Step 5: Solve for x
    x = 252,950,603.96/18,364.50
  6. Step 6: Final answer
    x = 13,773.89

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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.