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Finding the Fourth Proportional to 78,939.54, 108,898.59 and 57,395.90

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Solution

The fourth proportional to 78,939.54, 108,898.59 and 57,395.90 is: 79,178.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,939.54 : 108,898.59 = 57,395.90 : x
  2. Step 2: Convert to fraction form
    78,939.54/108,898.59 = 57,395.90/x
  3. Step 3: Cross multiply
    78,939.54x = 108,898.59 × 57,395.90
  4. Step 4: Simplify right side
    78,939.54x = 6,250,332,581.78
  5. Step 5: Solve for x
    x = 6,250,332,581.78/78,939.54
  6. Step 6: Final answer
    x = 79,178.73

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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.