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Finding the Fourth Proportional to 20,302.81, 30,456.69 and 8,612.08

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Solution

The fourth proportional to 20,302.81, 30,456.69 and 8,612.08 is: 12,919.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,302.81 : 30,456.69 = 8,612.08 : x
  2. Step 2: Convert to fraction form
    20,302.81/30,456.69 = 8,612.08/x
  3. Step 3: Cross multiply
    20,302.81x = 30,456.69 × 8,612.08
  4. Step 4: Simplify right side
    20,302.81x = 262,295,450.82
  5. Step 5: Solve for x
    x = 262,295,450.82/20,302.81
  6. Step 6: Final answer
    x = 12,919.17

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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.