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Finding the Fourth Proportional to 86,659.78, 130,037.73 and 42,286.90

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Solution

The fourth proportional to 86,659.78, 130,037.73 and 42,286.90 is: 63,453.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,659.78 : 130,037.73 = 42,286.90 : x
  2. Step 2: Convert to fraction form
    86,659.78/130,037.73 = 42,286.90/x
  3. Step 3: Cross multiply
    86,659.78x = 130,037.73 × 42,286.90
  4. Step 4: Simplify right side
    86,659.78x = 5,498,892,484.74
  5. Step 5: Solve for x
    x = 5,498,892,484.74/86,659.78
  6. Step 6: Final answer
    x = 63,453.80

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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.