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Finding the Fourth Proportional to 19,920.90, 29,892.15 and 8,235.30

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Solution

The fourth proportional to 19,920.90, 29,892.15 and 8,235.30 is: 12,357.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,920.90 : 29,892.15 = 8,235.30 : x
  2. Step 2: Convert to fraction form
    19,920.90/29,892.15 = 8,235.30/x
  3. Step 3: Cross multiply
    19,920.90x = 29,892.15 × 8,235.30
  4. Step 4: Simplify right side
    19,920.90x = 246,170,822.90
  5. Step 5: Solve for x
    x = 246,170,822.90/19,920.90
  6. Step 6: Final answer
    x = 12,357.41

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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.