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Finding the Fourth Proportional to 18,902.61, 28,351.42 and 6,422.13

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Solution

The fourth proportional to 18,902.61, 28,351.42 and 6,422.13 is: 9,632.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,902.61 : 28,351.42 = 6,422.13 : x
  2. Step 2: Convert to fraction form
    18,902.61/28,351.42 = 6,422.13/x
  3. Step 3: Cross multiply
    18,902.61x = 28,351.42 × 6,422.13
  4. Step 4: Simplify right side
    18,902.61x = 182,076,488.87
  5. Step 5: Solve for x
    x = 182,076,488.87/18,902.61
  6. Step 6: Final answer
    x = 9,632.35

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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.