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Finding the Fourth Proportional to 20,603.80, 30,905.70 and 20,385.10

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Solution

The fourth proportional to 20,603.80, 30,905.70 and 20,385.10 is: 30,577.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,603.80 : 30,905.70 = 20,385.10 : x
  2. Step 2: Convert to fraction form
    20,603.80/30,905.70 = 20,385.10/x
  3. Step 3: Cross multiply
    20,603.80x = 30,905.70 × 20,385.10
  4. Step 4: Simplify right side
    20,603.80x = 630,015,785.07
  5. Step 5: Solve for x
    x = 630,015,785.07/20,603.80
  6. Step 6: Final answer
    x = 30,577.65

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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.