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Finding the Fourth Proportional to 861.42, 1,292.39 and 341.51

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Solution

The fourth proportional to 861.42, 1,292.39 and 341.51 is: 512.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    861.42 : 1,292.39 = 341.51 : x
  2. Step 2: Convert to fraction form
    861.42/1,292.39 = 341.51/x
  3. Step 3: Cross multiply
    861.42x = 1,292.39 × 341.51
  4. Step 4: Simplify right side
    861.42x = 441,355.94
  5. Step 5: Solve for x
    x = 441,355.94/861.42
  6. Step 6: Final answer
    x = 512.36

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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.