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Finding the Fourth Proportional to 18,371.50, 25,353.08 and 9,988

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Solution

The fourth proportional to 18,371.50, 25,353.08 and 9,988 is: 13,783.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.50 : 25,353.08 = 9,988 : x
  2. Step 2: Convert to fraction form
    18,371.50/25,353.08 = 9,988/x
  3. Step 3: Cross multiply
    18,371.50x = 25,353.08 × 9,988
  4. Step 4: Simplify right side
    18,371.50x = 253,226,563.04
  5. Step 5: Solve for x
    x = 253,226,563.04/18,371.50
  6. Step 6: Final answer
    x = 13,783.66

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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.