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Finding the Fourth Proportional to 390.74, 585.98 and 217.49

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Solution

The fourth proportional to 390.74, 585.98 and 217.49 is: 326.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.74 : 585.98 = 217.49 : x
  2. Step 2: Convert to fraction form
    390.74/585.98 = 217.49/x
  3. Step 3: Cross multiply
    390.74x = 585.98 × 217.49
  4. Step 4: Simplify right side
    390.74x = 127,440.77
  5. Step 5: Solve for x
    x = 127,440.77/390.74
  6. Step 6: Final answer
    x = 326.16

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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.