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Finding the Fourth Proportional to 78,078.74, 107,747.77 and 42,267.97

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Solution

The fourth proportional to 78,078.74, 107,747.77 and 42,267.97 is: 58,329.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,078.74 : 107,747.77 = 42,267.97 : x
  2. Step 2: Convert to fraction form
    78,078.74/107,747.77 = 42,267.97/x
  3. Step 3: Cross multiply
    78,078.74x = 107,747.77 × 42,267.97
  4. Step 4: Simplify right side
    78,078.74x = 4,554,279,509.93
  5. Step 5: Solve for x
    x = 4,554,279,509.93/78,078.74
  6. Step 6: Final answer
    x = 58,329.32

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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.