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Finding the Fourth Proportional to 861.15, 1,188.41 and 529.77

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Solution

The fourth proportional to 861.15, 1,188.41 and 529.77 is: 731.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.15 : 1,188.41 = 529.77 : x
  2. Step 2: Convert to fraction form
    861.15/1,188.41 = 529.77/x
  3. Step 3: Cross multiply
    861.15x = 1,188.41 × 529.77
  4. Step 4: Simplify right side
    861.15x = 629,575.37
  5. Step 5: Solve for x
    x = 629,575.37/861.15
  6. Step 6: Final answer
    x = 731.09

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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.