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Finding the Fourth Proportional to 86,857.56, 130,286.52 and 21,193.56

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Solution

The fourth proportional to 86,857.56, 130,286.52 and 21,193.56 is: 31,790.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,857.56 : 130,286.52 = 21,193.56 : x
  2. Step 2: Convert to fraction form
    86,857.56/130,286.52 = 21,193.56/x
  3. Step 3: Cross multiply
    86,857.56x = 130,286.52 × 21,193.56
  4. Step 4: Simplify right side
    86,857.56x = 2,761,235,178.81
  5. Step 5: Solve for x
    x = 2,761,235,178.81/86,857.56
  6. Step 6: Final answer
    x = 31,790.38

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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.