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Finding the Fourth Proportional to 557.78, 837.08 and 211.45

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Solution

The fourth proportional to 557.78, 837.08 and 211.45 is: 317.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    557.78 : 837.08 = 211.45 : x
  2. Step 2: Convert to fraction form
    557.78/837.08 = 211.45/x
  3. Step 3: Cross multiply
    557.78x = 837.08 × 211.45
  4. Step 4: Simplify right side
    557.78x = 177,000.57
  5. Step 5: Solve for x
    x = 177,000.57/557.78
  6. Step 6: Final answer
    x = 317.33

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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.