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Finding the Fourth Proportional to 20,580.39, 30,838.39 and 15,911.91

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Solution

The fourth proportional to 20,580.39, 30,838.39 and 15,911.91 is: 23,842.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,580.39 : 30,838.39 = 15,911.91 : x
  2. Step 2: Convert to fraction form
    20,580.39/30,838.39 = 15,911.91/x
  3. Step 3: Cross multiply
    20,580.39x = 30,838.39 × 15,911.91
  4. Step 4: Simplify right side
    20,580.39x = 490,697,646.45
  5. Step 5: Solve for x
    x = 490,697,646.45/20,580.39
  6. Step 6: Final answer
    x = 23,842.97

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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.