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Finding the Fourth Proportional to 390.36, 585 and 332.28

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Solution

The fourth proportional to 390.36, 585 and 332.28 is: 497.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.36 : 585 = 332.28 : x
  2. Step 2: Convert to fraction form
    390.36/585 = 332.28/x
  3. Step 3: Cross multiply
    390.36x = 585 × 332.28
  4. Step 4: Simplify right side
    390.36x = 194,383.80
  5. Step 5: Solve for x
    x = 194,383.80/390.36
  6. Step 6: Final answer
    x = 497.96

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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.