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Finding the Fourth Proportional to 20,603.45, 30,905.18 and 5,021.21

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Solution

The fourth proportional to 20,603.45, 30,905.18 and 5,021.21 is: 7,531.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.45 : 30,905.18 = 5,021.21 : x
  2. Step 2: Convert to fraction form
    20,603.45/30,905.18 = 5,021.21/x
  3. Step 3: Cross multiply
    20,603.45x = 30,905.18 × 5,021.21
  4. Step 4: Simplify right side
    20,603.45x = 155,181,373.76
  5. Step 5: Solve for x
    x = 155,181,373.76/20,603.45
  6. Step 6: Final answer
    x = 7,531.82

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Similar ratio
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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.