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Finding the Fourth Proportional to 85,405.53, 128,086.19 and 25,419.92

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Solution

The fourth proportional to 85,405.53, 128,086.19 and 25,419.92 is: 38,123.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,405.53 : 128,086.19 = 25,419.92 : x
  2. Step 2: Convert to fraction form
    85,405.53/128,086.19 = 25,419.92/x
  3. Step 3: Cross multiply
    85,405.53x = 128,086.19 × 25,419.92
  4. Step 4: Simplify right side
    85,405.53x = 3,255,940,575.81
  5. Step 5: Solve for x
    x = 3,255,940,575.81/85,405.53
  6. Step 6: Final answer
    x = 38,123.30

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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.