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Finding the Fourth Proportional to 18,138.78, 25,009.29 and 12,462.30

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Solution

The fourth proportional to 18,138.78, 25,009.29 and 12,462.30 is: 17,182.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,138.78 : 25,009.29 = 12,462.30 : x
  2. Step 2: Convert to fraction form
    18,138.78/25,009.29 = 12,462.30/x
  3. Step 3: Cross multiply
    18,138.78x = 25,009.29 × 12,462.30
  4. Step 4: Simplify right side
    18,138.78x = 311,673,274.77
  5. Step 5: Solve for x
    x = 311,673,274.77/18,138.78
  6. Step 6: Final answer
    x = 17,182.70

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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.