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Finding the Fourth Proportional to 529.18, 792.24 and 399.72

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Solution

The fourth proportional to 529.18, 792.24 and 399.72 is: 598.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    529.18 : 792.24 = 399.72 : x
  2. Step 2: Convert to fraction form
    529.18/792.24 = 399.72/x
  3. Step 3: Cross multiply
    529.18x = 792.24 × 399.72
  4. Step 4: Simplify right side
    529.18x = 316,670.21
  5. Step 5: Solve for x
    x = 316,670.21/529.18
  6. Step 6: Final answer
    x = 598.42

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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.