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Finding the Fourth Proportional to 20,124.70, 30,215.85 and 11,376.70

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Solution

The fourth proportional to 20,124.70, 30,215.85 and 11,376.70 is: 17,081.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,124.70 : 30,215.85 = 11,376.70 : x
  2. Step 2: Convert to fraction form
    20,124.70/30,215.85 = 11,376.70/x
  3. Step 3: Cross multiply
    20,124.70x = 30,215.85 × 11,376.70
  4. Step 4: Simplify right side
    20,124.70x = 343,756,660.70
  5. Step 5: Solve for x
    x = 343,756,660.70/20,124.70
  6. Step 6: Final answer
    x = 17,081.33

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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.