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Finding the Fourth Proportional to 390.34, 585.37 and 325.74

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Solution

The fourth proportional to 390.34, 585.37 and 325.74 is: 488.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.34 : 585.37 = 325.74 : x
  2. Step 2: Convert to fraction form
    390.34/585.37 = 325.74/x
  3. Step 3: Cross multiply
    390.34x = 585.37 × 325.74
  4. Step 4: Simplify right side
    390.34x = 190,678.42
  5. Step 5: Solve for x
    x = 190,678.42/390.34
  6. Step 6: Final answer
    x = 488.49

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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.