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Finding the Fourth Proportional to 61,139.54, 91,723.12 and 21,696.66

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Solution

The fourth proportional to 61,139.54, 91,723.12 and 21,696.66 is: 32,549.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,139.54 : 91,723.12 = 21,696.66 : x
  2. Step 2: Convert to fraction form
    61,139.54/91,723.12 = 21,696.66/x
  3. Step 3: Cross multiply
    61,139.54x = 91,723.12 × 21,696.66
  4. Step 4: Simplify right side
    61,139.54x = 1,990,085,294.54
  5. Step 5: Solve for x
    x = 1,990,085,294.54/61,139.54
  6. Step 6: Final answer
    x = 32,549.89

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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.