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Finding the Fourth Proportional to 18,188.69, 25,090.12 and 10,918.90

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Solution

The fourth proportional to 18,188.69, 25,090.12 and 10,918.90 is: 15,061.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,188.69 : 25,090.12 = 10,918.90 : x
  2. Step 2: Convert to fraction form
    18,188.69/25,090.12 = 10,918.90/x
  3. Step 3: Cross multiply
    18,188.69x = 25,090.12 × 10,918.90
  4. Step 4: Simplify right side
    18,188.69x = 273,956,556.28
  5. Step 5: Solve for x
    x = 273,956,556.28/18,188.69
  6. Step 6: Final answer
    x = 15,061.92

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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.