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Finding the Fourth Proportional to 18,372.32, 25,353.98 and 9,989

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Solution

The fourth proportional to 18,372.32, 25,353.98 and 9,989 is: 13,784.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,372.32 : 25,353.98 = 9,989 : x
  2. Step 2: Convert to fraction form
    18,372.32/25,353.98 = 9,989/x
  3. Step 3: Cross multiply
    18,372.32x = 25,353.98 × 9,989
  4. Step 4: Simplify right side
    18,372.32x = 253,260,906.22
  5. Step 5: Solve for x
    x = 253,260,906.22/18,372.32
  6. Step 6: Final answer
    x = 13,784.92

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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.