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Finding the Fourth Proportional to 85,488.75, 128,173.86 and 38,078.71

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Solution

The fourth proportional to 85,488.75, 128,173.86 and 38,078.71 is: 57,091.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,488.75 : 128,173.86 = 38,078.71 : x
  2. Step 2: Convert to fraction form
    85,488.75/128,173.86 = 38,078.71/x
  3. Step 3: Cross multiply
    85,488.75x = 128,173.86 × 38,078.71
  4. Step 4: Simplify right side
    85,488.75x = 4,880,694,924.09
  5. Step 5: Solve for x
    x = 4,880,694,924.09/85,488.75
  6. Step 6: Final answer
    x = 57,091.66

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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.