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Finding the Fourth Proportional to 18,371.56, 25,352.70 and 9,988

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Solution

The fourth proportional to 18,371.56, 25,352.70 and 9,988 is: 13,783.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.56 : 25,352.70 = 9,988 : x
  2. Step 2: Convert to fraction form
    18,371.56/25,352.70 = 9,988/x
  3. Step 3: Cross multiply
    18,371.56x = 25,352.70 × 9,988
  4. Step 4: Simplify right side
    18,371.56x = 253,222,767.60
  5. Step 5: Solve for x
    x = 253,222,767.60/18,371.56
  6. Step 6: Final answer
    x = 13,783.41

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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.