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Finding the Fourth Proportional to 18,438.66, 27,659.16 and 5,290.74

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Solution

The fourth proportional to 18,438.66, 27,659.16 and 5,290.74 is: 7,936.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.66 : 27,659.16 = 5,290.74 : x
  2. Step 2: Convert to fraction form
    18,438.66/27,659.16 = 5,290.74/x
  3. Step 3: Cross multiply
    18,438.66x = 27,659.16 × 5,290.74
  4. Step 4: Simplify right side
    18,438.66x = 146,337,424.18
  5. Step 5: Solve for x
    x = 146,337,424.18/18,438.66
  6. Step 6: Final answer
    x = 7,936.45

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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.