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Finding the Fourth Proportional to 20,187.90, 30,271.05 and 8,487.90

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Solution

The fourth proportional to 20,187.90, 30,271.05 and 8,487.90 is: 12,727.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,187.90 : 30,271.05 = 8,487.90 : x
  2. Step 2: Convert to fraction form
    20,187.90/30,271.05 = 8,487.90/x
  3. Step 3: Cross multiply
    20,187.90x = 30,271.05 × 8,487.90
  4. Step 4: Simplify right side
    20,187.90x = 256,937,645.30
  5. Step 5: Solve for x
    x = 256,937,645.30/20,187.90
  6. Step 6: Final answer
    x = 12,727.31

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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.