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Finding the Fourth Proportional to 85,911.36, 128,892 and 38,515.92

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Solution

The fourth proportional to 85,911.36, 128,892 and 38,515.92 is: 57,785.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,911.36 : 128,892 = 38,515.92 : x
  2. Step 2: Convert to fraction form
    85,911.36/128,892 = 38,515.92/x
  3. Step 3: Cross multiply
    85,911.36x = 128,892 × 38,515.92
  4. Step 4: Simplify right side
    85,911.36x = 4,964,393,960.64
  5. Step 5: Solve for x
    x = 4,964,393,960.64/85,911.36
  6. Step 6: Final answer
    x = 57,785.07

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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.