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Finding the Fourth Proportional to 18,371.34, 25,352.31 and 9,987.90

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Solution

The fourth proportional to 18,371.34, 25,352.31 and 9,987.90 is: 13,783.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,371.34 : 25,352.31 = 9,987.90 : x
  2. Step 2: Convert to fraction form
    18,371.34/25,352.31 = 9,987.90/x
  3. Step 3: Cross multiply
    18,371.34x = 25,352.31 × 9,987.90
  4. Step 4: Simplify right side
    18,371.34x = 253,216,337.05
  5. Step 5: Solve for x
    x = 253,216,337.05/18,371.34
  6. Step 6: Final answer
    x = 13,783.23

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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.