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Finding the Fourth Proportional to 18,402.40, 25,395.78 and 11,330.20

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Solution

The fourth proportional to 18,402.40, 25,395.78 and 11,330.20 is: 15,635.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,402.40 : 25,395.78 = 11,330.20 : x
  2. Step 2: Convert to fraction form
    18,402.40/25,395.78 = 11,330.20/x
  3. Step 3: Cross multiply
    18,402.40x = 25,395.78 × 11,330.20
  4. Step 4: Simplify right side
    18,402.40x = 287,739,266.56
  5. Step 5: Solve for x
    x = 287,739,266.56/18,402.40
  6. Step 6: Final answer
    x = 15,635.96

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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.