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Finding the Fourth Proportional to 61,680.96, 85,104 and 39,312

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Solution

The fourth proportional to 61,680.96, 85,104 and 39,312 is: 54,240.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,680.96 : 85,104 = 39,312 : x
  2. Step 2: Convert to fraction form
    61,680.96/85,104 = 39,312/x
  3. Step 3: Cross multiply
    61,680.96x = 85,104 × 39,312
  4. Step 4: Simplify right side
    61,680.96x = 3,345,608,448
  5. Step 5: Solve for x
    x = 3,345,608,448/61,680.96
  6. Step 6: Final answer
    x = 54,240.54

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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.