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Finding the Fourth Proportional to 86,622.81, 129,934.22 and 20,958.81

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Solution

The fourth proportional to 86,622.81, 129,934.22 and 20,958.81 is: 31,438.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,622.81 : 129,934.22 = 20,958.81 : x
  2. Step 2: Convert to fraction form
    86,622.81/129,934.22 = 20,958.81/x
  3. Step 3: Cross multiply
    86,622.81x = 129,934.22 × 20,958.81
  4. Step 4: Simplify right side
    86,622.81x = 2,723,266,629.48
  5. Step 5: Solve for x
    x = 2,723,266,629.48/86,622.81
  6. Step 6: Final answer
    x = 31,438.22

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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.