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Finding the Fourth Proportional to 528.12, 792.18 and 319.94

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Solution

The fourth proportional to 528.12, 792.18 and 319.94 is: 479.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 792.18 = 319.94 : x
  2. Step 2: Convert to fraction form
    528.12/792.18 = 319.94/x
  3. Step 3: Cross multiply
    528.12x = 792.18 × 319.94
  4. Step 4: Simplify right side
    528.12x = 253,448.89
  5. Step 5: Solve for x
    x = 253,448.89/528.12
  6. Step 6: Final answer
    x = 479.91

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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.