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Finding the Fourth Proportional to 85,679.94, 128,550.66 and 38,291.10

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Solution

The fourth proportional to 85,679.94, 128,550.66 and 38,291.10 is: 57,450.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,679.94 : 128,550.66 = 38,291.10 : x
  2. Step 2: Convert to fraction form
    85,679.94/128,550.66 = 38,291.10/x
  3. Step 3: Cross multiply
    85,679.94x = 128,550.66 × 38,291.10
  4. Step 4: Simplify right side
    85,679.94x = 4,922,346,177.13
  5. Step 5: Solve for x
    x = 4,922,346,177.13/85,679.94
  6. Step 6: Final answer
    x = 57,450.39

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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.