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Finding the Fourth Proportional to 18,426.17, 27,643.91 and 7,890.90

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Solution

The fourth proportional to 18,426.17, 27,643.91 and 7,890.90 is: 11,838.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,426.17 : 27,643.91 = 7,890.90 : x
  2. Step 2: Convert to fraction form
    18,426.17/27,643.91 = 7,890.90/x
  3. Step 3: Cross multiply
    18,426.17x = 27,643.91 × 7,890.90
  4. Step 4: Simplify right side
    18,426.17x = 218,135,289.96
  5. Step 5: Solve for x
    x = 218,135,289.96/18,426.17
  6. Step 6: Final answer
    x = 11,838.34

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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.