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Finding the Fourth Proportional to 85,658.72, 128,496.68 and 29,491.39

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Solution

The fourth proportional to 85,658.72, 128,496.68 and 29,491.39 is: 44,240.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,658.72 : 128,496.68 = 29,491.39 : x
  2. Step 2: Convert to fraction form
    85,658.72/128,496.68 = 29,491.39/x
  3. Step 3: Cross multiply
    85,658.72x = 128,496.68 × 29,491.39
  4. Step 4: Simplify right side
    85,658.72x = 3,789,545,556.13
  5. Step 5: Solve for x
    x = 3,789,545,556.13/85,658.72
  6. Step 6: Final answer
    x = 44,240.05

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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.