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Finding the Fourth Proportional to 529.35, 791.87 and 391.43

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Solution

The fourth proportional to 529.35, 791.87 and 391.43 is: 585.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.35 : 791.87 = 391.43 : x
  2. Step 2: Convert to fraction form
    529.35/791.87 = 391.43/x
  3. Step 3: Cross multiply
    529.35x = 791.87 × 391.43
  4. Step 4: Simplify right side
    529.35x = 309,955.76
  5. Step 5: Solve for x
    x = 309,955.76/529.35
  6. Step 6: Final answer
    x = 585.54

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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.