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Finding the Fourth Proportional to 851.78, 1,174.38 and 556.58

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Solution

The fourth proportional to 851.78, 1,174.38 and 556.58 is: 767.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.78 : 1,174.38 = 556.58 : x
  2. Step 2: Convert to fraction form
    851.78/1,174.38 = 556.58/x
  3. Step 3: Cross multiply
    851.78x = 1,174.38 × 556.58
  4. Step 4: Simplify right side
    851.78x = 653,636.42
  5. Step 5: Solve for x
    x = 653,636.42/851.78
  6. Step 6: Final answer
    x = 767.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.