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Finding the Fourth Proportional to 390.90, 585.66 and 348.54

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Solution

The fourth proportional to 390.90, 585.66 and 348.54 is: 522.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.90 : 585.66 = 348.54 : x
  2. Step 2: Convert to fraction form
    390.90/585.66 = 348.54/x
  3. Step 3: Cross multiply
    390.90x = 585.66 × 348.54
  4. Step 4: Simplify right side
    390.90x = 204,125.94
  5. Step 5: Solve for x
    x = 204,125.94/390.90
  6. Step 6: Final answer
    x = 522.19

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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.