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Finding the Fourth Proportional to 18,918.30, 26,090.01 and 15,141.81

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Solution

The fourth proportional to 18,918.30, 26,090.01 and 15,141.81 is: 20,881.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.30 : 26,090.01 = 15,141.81 : x
  2. Step 2: Convert to fraction form
    18,918.30/26,090.01 = 15,141.81/x
  3. Step 3: Cross multiply
    18,918.30x = 26,090.01 × 15,141.81
  4. Step 4: Simplify right side
    18,918.30x = 395,049,974.32
  5. Step 5: Solve for x
    x = 395,049,974.32/18,918.30
  6. Step 6: Final answer
    x = 20,881.90

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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.