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Finding the Fourth Proportional to 20,014.20, 29,978.10 and 13,015.80

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Solution

The fourth proportional to 20,014.20, 29,978.10 and 13,015.80 is: 19,495.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,014.20 : 29,978.10 = 13,015.80 : x
  2. Step 2: Convert to fraction form
    20,014.20/29,978.10 = 13,015.80/x
  3. Step 3: Cross multiply
    20,014.20x = 29,978.10 × 13,015.80
  4. Step 4: Simplify right side
    20,014.20x = 390,188,953.98
  5. Step 5: Solve for x
    x = 390,188,953.98/20,014.20
  6. Step 6: Final answer
    x = 19,495.61

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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.