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Finding the Fourth Proportional to 20,215.78, 30,310.52 and 9,685.52

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Solution

The fourth proportional to 20,215.78, 30,310.52 and 9,685.52 is: 14,521.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,215.78 : 30,310.52 = 9,685.52 : x
  2. Step 2: Convert to fraction form
    20,215.78/30,310.52 = 9,685.52/x
  3. Step 3: Cross multiply
    20,215.78x = 30,310.52 × 9,685.52
  4. Step 4: Simplify right side
    20,215.78x = 293,573,147.67
  5. Step 5: Solve for x
    x = 293,573,147.67/20,215.78
  6. Step 6: Final answer
    x = 14,521.98

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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.