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Finding the Fourth Proportional to 61,102.92, 91,631.88 and 21,111.65

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Solution

The fourth proportional to 61,102.92, 91,631.88 and 21,111.65 is: 31,659.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,102.92 : 91,631.88 = 21,111.65 : x
  2. Step 2: Convert to fraction form
    61,102.92/91,631.88 = 21,111.65/x
  3. Step 3: Cross multiply
    61,102.92x = 91,631.88 × 21,111.65
  4. Step 4: Simplify right side
    61,102.92x = 1,934,499,721.24
  5. Step 5: Solve for x
    x = 1,934,499,721.24/61,102.92
  6. Step 6: Final answer
    x = 31,659.69

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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.