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Finding the Fourth Proportional to 20,658.15, 30,987.29 and 8,181.12

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Solution

The fourth proportional to 20,658.15, 30,987.29 and 8,181.12 is: 12,271.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,658.15 : 30,987.29 = 8,181.12 : x
  2. Step 2: Convert to fraction form
    20,658.15/30,987.29 = 8,181.12/x
  3. Step 3: Cross multiply
    20,658.15x = 30,987.29 × 8,181.12
  4. Step 4: Simplify right side
    20,658.15x = 253,510,697.06
  5. Step 5: Solve for x
    x = 253,510,697.06/20,658.15
  6. Step 6: Final answer
    x = 12,271.70

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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.