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Finding the Fourth Proportional to 18,082.61, 27,128.05 and 6,989.39

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Solution

The fourth proportional to 18,082.61, 27,128.05 and 6,989.39 is: 10,485.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,082.61 : 27,128.05 = 6,989.39 : x
  2. Step 2: Convert to fraction form
    18,082.61/27,128.05 = 6,989.39/x
  3. Step 3: Cross multiply
    18,082.61x = 27,128.05 × 6,989.39
  4. Step 4: Simplify right side
    18,082.61x = 189,608,368.28
  5. Step 5: Solve for x
    x = 189,608,368.28/18,082.61
  6. Step 6: Final answer
    x = 10,485.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.