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Finding the Fourth Proportional to 20,493.20, 30,739.80 and 14,920.40

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Solution

The fourth proportional to 20,493.20, 30,739.80 and 14,920.40 is: 22,380.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,493.20 : 30,739.80 = 14,920.40 : x
  2. Step 2: Convert to fraction form
    20,493.20/30,739.80 = 14,920.40/x
  3. Step 3: Cross multiply
    20,493.20x = 30,739.80 × 14,920.40
  4. Step 4: Simplify right side
    20,493.20x = 458,650,111.92
  5. Step 5: Solve for x
    x = 458,650,111.92/20,493.20
  6. Step 6: Final answer
    x = 22,380.60

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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.