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Finding the Fourth Proportional to 20,081.79, 30,129.98 and 6,935.49

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Solution

The fourth proportional to 20,081.79, 30,129.98 and 6,935.49 is: 10,405.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.79 : 30,129.98 = 6,935.49 : x
  2. Step 2: Convert to fraction form
    20,081.79/30,129.98 = 6,935.49/x
  3. Step 3: Cross multiply
    20,081.79x = 30,129.98 × 6,935.49
  4. Step 4: Simplify right side
    20,081.79x = 208,966,140.31
  5. Step 5: Solve for x
    x = 208,966,140.31/20,081.79
  6. Step 6: Final answer
    x = 10,405.75

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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.