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Finding the Fourth Proportional to 18,690.90, 28,040.46 and 5,542.47

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Solution

The fourth proportional to 18,690.90, 28,040.46 and 5,542.47 is: 8,314.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.90 : 28,040.46 = 5,542.47 : x
  2. Step 2: Convert to fraction form
    18,690.90/28,040.46 = 5,542.47/x
  3. Step 3: Cross multiply
    18,690.90x = 28,040.46 × 5,542.47
  4. Step 4: Simplify right side
    18,690.90x = 155,413,408.34
  5. Step 5: Solve for x
    x = 155,413,408.34/18,690.90
  6. Step 6: Final answer
    x = 8,314.92

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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.