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Finding the Fourth Proportional to 3,124.89, 4,687.30 and 816.39

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Solution

The fourth proportional to 3,124.89, 4,687.30 and 816.39 is: 1,224.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,124.89 : 4,687.30 = 816.39 : x
  2. Step 2: Convert to fraction form
    3,124.89/4,687.30 = 816.39/x
  3. Step 3: Cross multiply
    3,124.89x = 4,687.30 × 816.39
  4. Step 4: Simplify right side
    3,124.89x = 3,826,664.85
  5. Step 5: Solve for x
    x = 3,826,664.85/3,124.89
  6. Step 6: Final answer
    x = 1,224.58

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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.