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Finding the Fourth Proportional to 18,605.40, 27,911.70 and 5,458.20

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Solution

The fourth proportional to 18,605.40, 27,911.70 and 5,458.20 is: 8,188.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,605.40 : 27,911.70 = 5,458.20 : x
  2. Step 2: Convert to fraction form
    18,605.40/27,911.70 = 5,458.20/x
  3. Step 3: Cross multiply
    18,605.40x = 27,911.70 × 5,458.20
  4. Step 4: Simplify right side
    18,605.40x = 152,347,640.94
  5. Step 5: Solve for x
    x = 152,347,640.94/18,605.40
  6. Step 6: Final answer
    x = 8,188.36

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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.