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Finding the Fourth Proportional to 39,065.70, 53,906.81 and 21,834.84

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Solution

The fourth proportional to 39,065.70, 53,906.81 and 21,834.84 is: 30,129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,065.70 : 53,906.81 = 21,834.84 : x
  2. Step 2: Convert to fraction form
    39,065.70/53,906.81 = 21,834.84/x
  3. Step 3: Cross multiply
    39,065.70x = 53,906.81 × 21,834.84
  4. Step 4: Simplify right side
    39,065.70x = 1,177,046,462.09
  5. Step 5: Solve for x
    x = 1,177,046,462.09/39,065.70
  6. Step 6: Final answer
    x = 30,129.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.