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Finding the Fourth Proportional to 57,790.38, 79,721.73 and 39,895.38

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Solution

The fourth proportional to 57,790.38, 79,721.73 and 39,895.38 is: 55,035.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,790.38 : 79,721.73 = 39,895.38 : x
  2. Step 2: Convert to fraction form
    57,790.38/79,721.73 = 39,895.38/x
  3. Step 3: Cross multiply
    57,790.38x = 79,721.73 × 39,895.38
  4. Step 4: Simplify right side
    57,790.38x = 3,180,528,712.61
  5. Step 5: Solve for x
    x = 3,180,528,712.61/57,790.38
  6. Step 6: Final answer
    x = 55,035.61

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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.