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Finding the Fourth Proportional to 86,101.12, 128,773.98 and 76,679.92

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Solution

The fourth proportional to 86,101.12, 128,773.98 and 76,679.92 is: 114,683.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,101.12 : 128,773.98 = 76,679.92 : x
  2. Step 2: Convert to fraction form
    86,101.12/128,773.98 = 76,679.92/x
  3. Step 3: Cross multiply
    86,101.12x = 128,773.98 × 76,679.92
  4. Step 4: Simplify right side
    86,101.12x = 9,874,378,484.48
  5. Step 5: Solve for x
    x = 9,874,378,484.48/86,101.12
  6. Step 6: Final answer
    x = 114,683.51

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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.