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Finding the Fourth Proportional to 348.15, 479.85 and 315.15

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Solution

The fourth proportional to 348.15, 479.85 and 315.15 is: 434.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.15 : 479.85 = 315.15 : x
  2. Step 2: Convert to fraction form
    348.15/479.85 = 315.15/x
  3. Step 3: Cross multiply
    348.15x = 479.85 × 315.15
  4. Step 4: Simplify right side
    348.15x = 151,224.73
  5. Step 5: Solve for x
    x = 151,224.73/348.15
  6. Step 6: Final answer
    x = 434.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.