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Finding the Fourth Proportional to 390.52, 585.10 and 348.15

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Solution

The fourth proportional to 390.52, 585.10 and 348.15 is: 521.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.52 : 585.10 = 348.15 : x
  2. Step 2: Convert to fraction form
    390.52/585.10 = 348.15/x
  3. Step 3: Cross multiply
    390.52x = 585.10 × 348.15
  4. Step 4: Simplify right side
    390.52x = 203,702.57
  5. Step 5: Solve for x
    x = 203,702.57/390.52
  6. Step 6: Final answer
    x = 521.62

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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.