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Finding the Fourth Proportional to 20,603.20, 30,904.80 and 5,020.96

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Solution

The fourth proportional to 20,603.20, 30,904.80 and 5,020.96 is: 7,531.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.20 : 30,904.80 = 5,020.96 : x
  2. Step 2: Convert to fraction form
    20,603.20/30,904.80 = 5,020.96/x
  3. Step 3: Cross multiply
    20,603.20x = 30,904.80 × 5,020.96
  4. Step 4: Simplify right side
    20,603.20x = 155,171,764.61
  5. Step 5: Solve for x
    x = 155,171,764.61/20,603.20
  6. Step 6: Final answer
    x = 7,531.44

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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.