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Finding the Fourth Proportional to 76,115.36, 105,042.12 and 42,581.36

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Solution

The fourth proportional to 76,115.36, 105,042.12 and 42,581.36 is: 58,763.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,115.36 : 105,042.12 = 42,581.36 : x
  2. Step 2: Convert to fraction form
    76,115.36/105,042.12 = 42,581.36/x
  3. Step 3: Cross multiply
    76,115.36x = 105,042.12 × 42,581.36
  4. Step 4: Simplify right side
    76,115.36x = 4,472,836,326.88
  5. Step 5: Solve for x
    x = 4,472,836,326.88/76,115.36
  6. Step 6: Final answer
    x = 58,763.91

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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.