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Finding the Fourth Proportional to 18,122.90, 25,009.86 and 10,951.82

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Solution

The fourth proportional to 18,122.90, 25,009.86 and 10,951.82 is: 15,113.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,122.90 : 25,009.86 = 10,951.82 : x
  2. Step 2: Convert to fraction form
    18,122.90/25,009.86 = 10,951.82/x
  3. Step 3: Cross multiply
    18,122.90x = 25,009.86 × 10,951.82
  4. Step 4: Simplify right side
    18,122.90x = 273,903,484.95
  5. Step 5: Solve for x
    x = 273,903,484.95/18,122.90
  6. Step 6: Final answer
    x = 15,113.67

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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.