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Finding the Fourth Proportional to 18,371.32, 25,352.60 and 9,988

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Solution

The fourth proportional to 18,371.32, 25,352.60 and 9,988 is: 13,783.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.32 : 25,352.60 = 9,988 : x
  2. Step 2: Convert to fraction form
    18,371.32/25,352.60 = 9,988/x
  3. Step 3: Cross multiply
    18,371.32x = 25,352.60 × 9,988
  4. Step 4: Simplify right side
    18,371.32x = 253,221,718.86
  5. Step 5: Solve for x
    x = 253,221,718.86/18,371.32
  6. Step 6: Final answer
    x = 13,783.53

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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.