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Finding the Fourth Proportional to 851.40, 1,174.41 and 556.61

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Solution

The fourth proportional to 851.40, 1,174.41 and 556.61 is: 767.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.40 : 1,174.41 = 556.61 : x
  2. Step 2: Convert to fraction form
    851.40/1,174.41 = 556.61/x
  3. Step 3: Cross multiply
    851.40x = 1,174.41 × 556.61
  4. Step 4: Simplify right side
    851.40x = 653,682.48
  5. Step 5: Solve for x
    x = 653,682.48/851.40
  6. Step 6: Final answer
    x = 767.77

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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.