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Finding the Fourth Proportional to 20,491.74, 30,715.47 and 9,939.48

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Solution

The fourth proportional to 20,491.74, 30,715.47 and 9,939.48 is: 14,898.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,491.74 : 30,715.47 = 9,939.48 : x
  2. Step 2: Convert to fraction form
    20,491.74/30,715.47 = 9,939.48/x
  3. Step 3: Cross multiply
    20,491.74x = 30,715.47 × 9,939.48
  4. Step 4: Simplify right side
    20,491.74x = 305,295,799.76
  5. Step 5: Solve for x
    x = 305,295,799.76/20,491.74
  6. Step 6: Final answer
    x = 14,898.48

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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.