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Finding the Fourth Proportional to 61,890.67, 85,423.17 and 39,260.89

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Solution

The fourth proportional to 61,890.67, 85,423.17 and 39,260.89 is: 54,188.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,890.67 : 85,423.17 = 39,260.89 : x
  2. Step 2: Convert to fraction form
    61,890.67/85,423.17 = 39,260.89/x
  3. Step 3: Cross multiply
    61,890.67x = 85,423.17 × 39,260.89
  4. Step 4: Simplify right side
    61,890.67x = 3,353,789,680.82
  5. Step 5: Solve for x
    x = 3,353,789,680.82/61,890.67
  6. Step 6: Final answer
    x = 54,188.94

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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.