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Finding the Fourth Proportional to 558.88, 838.55 and 212.38

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Solution

The fourth proportional to 558.88, 838.55 and 212.38 is: 318.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    558.88 : 838.55 = 212.38 : x
  2. Step 2: Convert to fraction form
    558.88/838.55 = 212.38/x
  3. Step 3: Cross multiply
    558.88x = 838.55 × 212.38
  4. Step 4: Simplify right side
    558.88x = 178,089.68
  5. Step 5: Solve for x
    x = 178,089.68/558.88
  6. Step 6: Final answer
    x = 318.66

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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.