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Finding the Fourth Proportional to 528.36, 791.58 and 399.72

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Solution

The fourth proportional to 528.36, 791.58 and 399.72 is: 598.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.36 : 791.58 = 399.72 : x
  2. Step 2: Convert to fraction form
    528.36/791.58 = 399.72/x
  3. Step 3: Cross multiply
    528.36x = 791.58 × 399.72
  4. Step 4: Simplify right side
    528.36x = 316,410.36
  5. Step 5: Solve for x
    x = 316,410.36/528.36
  6. Step 6: Final answer
    x = 598.85

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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.