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Finding the Fourth Proportional to 3,185, 4,777.78 and 876.50

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Solution

The fourth proportional to 3,185, 4,777.78 and 876.50 is: 1,314.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,185 : 4,777.78 = 876.50 : x
  2. Step 2: Convert to fraction form
    3,185/4,777.78 = 876.50/x
  3. Step 3: Cross multiply
    3,185x = 4,777.78 × 876.50
  4. Step 4: Simplify right side
    3,185x = 4,187,724.17
  5. Step 5: Solve for x
    x = 4,187,724.17/3,185
  6. Step 6: Final answer
    x = 1,314.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.