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Finding the Fourth Proportional to 528.42, 791.40 and 345.36

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Solution

The fourth proportional to 528.42, 791.40 and 345.36 is: 517.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.42 : 791.40 = 345.36 : x
  2. Step 2: Convert to fraction form
    528.42/791.40 = 345.36/x
  3. Step 3: Cross multiply
    528.42x = 791.40 × 345.36
  4. Step 4: Simplify right side
    528.42x = 273,317.90
  5. Step 5: Solve for x
    x = 273,317.90/528.42
  6. Step 6: Final answer
    x = 517.24

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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.