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Finding the Fourth Proportional to 412.50, 618.85 and 123.95

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Solution

The fourth proportional to 412.50, 618.85 and 123.95 is: 185.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.50 : 618.85 = 123.95 : x
  2. Step 2: Convert to fraction form
    412.50/618.85 = 123.95/x
  3. Step 3: Cross multiply
    412.50x = 618.85 × 123.95
  4. Step 4: Simplify right side
    412.50x = 76,703.36
  5. Step 5: Solve for x
    x = 76,703.36/412.50
  6. Step 6: Final answer
    x = 185.95

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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.