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Finding the Fourth Proportional to 18,486.64, 25,530.20 and 11,775.28

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Solution

The fourth proportional to 18,486.64, 25,530.20 and 11,775.28 is: 16,261.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,486.64 : 25,530.20 = 11,775.28 : x
  2. Step 2: Convert to fraction form
    18,486.64/25,530.20 = 11,775.28/x
  3. Step 3: Cross multiply
    18,486.64x = 25,530.20 × 11,775.28
  4. Step 4: Simplify right side
    18,486.64x = 300,625,253.46
  5. Step 5: Solve for x
    x = 300,625,253.46/18,486.64
  6. Step 6: Final answer
    x = 16,261.76

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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.