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Finding the Fourth Proportional to 412.58, 618.76 and 138.66

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Solution

The fourth proportional to 412.58, 618.76 and 138.66 is: 207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.58 : 618.76 = 138.66 : x
  2. Step 2: Convert to fraction form
    412.58/618.76 = 138.66/x
  3. Step 3: Cross multiply
    412.58x = 618.76 × 138.66
  4. Step 4: Simplify right side
    412.58x = 85,798.99
  5. Step 5: Solve for x
    x = 85,798.99/412.58
  6. Step 6: Final answer
    x = 207.96

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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.