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Finding the Fourth Proportional to 61,687.91, 85,128.71 and 34,829.80

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Solution

The fourth proportional to 61,687.91, 85,128.71 and 34,829.80 is: 48,064.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,687.91 : 85,128.71 = 34,829.80 : x
  2. Step 2: Convert to fraction form
    61,687.91/85,128.71 = 34,829.80/x
  3. Step 3: Cross multiply
    61,687.91x = 85,128.71 × 34,829.80
  4. Step 4: Simplify right side
    61,687.91x = 2,965,015,556.59
  5. Step 5: Solve for x
    x = 2,965,015,556.59/61,687.91
  6. Step 6: Final answer
    x = 48,064.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.