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Finding the Fourth Proportional to 20,479.20, 30,747.60 and 12,703.20

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Solution

The fourth proportional to 20,479.20, 30,747.60 and 12,703.20 is: 19,072.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,479.20 : 30,747.60 = 12,703.20 : x
  2. Step 2: Convert to fraction form
    20,479.20/30,747.60 = 12,703.20/x
  3. Step 3: Cross multiply
    20,479.20x = 30,747.60 × 12,703.20
  4. Step 4: Simplify right side
    20,479.20x = 390,592,912.32
  5. Step 5: Solve for x
    x = 390,592,912.32/20,479.20
  6. Step 6: Final answer
    x = 19,072.66

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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.