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Finding the Fourth Proportional to 528.91, 792.90 and 285.15

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Solution

The fourth proportional to 528.91, 792.90 and 285.15 is: 427.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.91 : 792.90 = 285.15 : x
  2. Step 2: Convert to fraction form
    528.91/792.90 = 285.15/x
  3. Step 3: Cross multiply
    528.91x = 792.90 × 285.15
  4. Step 4: Simplify right side
    528.91x = 226,095.44
  5. Step 5: Solve for x
    x = 226,095.44/528.91
  6. Step 6: Final answer
    x = 427.47

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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.