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Finding the Fourth Proportional to 71,510.92, 98,685.75 and 39,682.78

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Solution

The fourth proportional to 71,510.92, 98,685.75 and 39,682.78 is: 54,762.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,510.92 : 98,685.75 = 39,682.78 : x
  2. Step 2: Convert to fraction form
    71,510.92/98,685.75 = 39,682.78/x
  3. Step 3: Cross multiply
    71,510.92x = 98,685.75 × 39,682.78
  4. Step 4: Simplify right side
    71,510.92x = 3,916,124,906.39
  5. Step 5: Solve for x
    x = 3,916,124,906.39/71,510.92
  6. Step 6: Final answer
    x = 54,762.61

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1.5x scale

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.