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Finding the Fourth Proportional to 20,085.79, 30,135.99 and 6,939.49

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Solution

The fourth proportional to 20,085.79, 30,135.99 and 6,939.49 is: 10,411.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,085.79 : 30,135.99 = 6,939.49 : x
  2. Step 2: Convert to fraction form
    20,085.79/30,135.99 = 6,939.49/x
  3. Step 3: Cross multiply
    20,085.79x = 30,135.99 × 6,939.49
  4. Step 4: Simplify right side
    20,085.79x = 209,128,401.25
  5. Step 5: Solve for x
    x = 209,128,401.25/20,085.79
  6. Step 6: Final answer
    x = 10,411.76

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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.