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Finding the Fourth Proportional to 20,486.60, 30,739.65 and 7,340.30

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Solution

The fourth proportional to 20,486.60, 30,739.65 and 7,340.30 is: 11,013.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,486.60 : 30,739.65 = 7,340.30 : x
  2. Step 2: Convert to fraction form
    20,486.60/30,739.65 = 7,340.30/x
  3. Step 3: Cross multiply
    20,486.60x = 30,739.65 × 7,340.30
  4. Step 4: Simplify right side
    20,486.60x = 225,638,252.90
  5. Step 5: Solve for x
    x = 225,638,252.90/20,486.60
  6. Step 6: Final answer
    x = 11,013.94

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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.