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Finding the Fourth Proportional to 861.70, 1,292.82 and 313.96

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Solution

The fourth proportional to 861.70, 1,292.82 and 313.96 is: 471.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.70 : 1,292.82 = 313.96 : x
  2. Step 2: Convert to fraction form
    861.70/1,292.82 = 313.96/x
  3. Step 3: Cross multiply
    861.70x = 1,292.82 × 313.96
  4. Step 4: Simplify right side
    861.70x = 405,893.77
  5. Step 5: Solve for x
    x = 405,893.77/861.70
  6. Step 6: Final answer
    x = 471.04

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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.