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Finding the Fourth Proportional to 18,638.60, 27,963.12 and 5,490.68

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Solution

The fourth proportional to 18,638.60, 27,963.12 and 5,490.68 is: 8,237.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,638.60 : 27,963.12 = 5,490.68 : x
  2. Step 2: Convert to fraction form
    18,638.60/27,963.12 = 5,490.68/x
  3. Step 3: Cross multiply
    18,638.60x = 27,963.12 × 5,490.68
  4. Step 4: Simplify right side
    18,638.60x = 153,536,543.72
  5. Step 5: Solve for x
    x = 153,536,543.72/18,638.60
  6. Step 6: Final answer
    x = 8,237.56

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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.