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Finding the Fourth Proportional to 20,603.90, 30,905.85 and 11,240.30

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Solution

The fourth proportional to 20,603.90, 30,905.85 and 11,240.30 is: 16,860.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.90 : 30,905.85 = 11,240.30 : x
  2. Step 2: Convert to fraction form
    20,603.90/30,905.85 = 11,240.30/x
  3. Step 3: Cross multiply
    20,603.90x = 30,905.85 × 11,240.30
  4. Step 4: Simplify right side
    20,603.90x = 347,391,025.76
  5. Step 5: Solve for x
    x = 347,391,025.76/20,603.90
  6. Step 6: Final answer
    x = 16,860.45

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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.