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Finding the Fourth Proportional to 348.35, 479.51 and 315.55

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Solution

The fourth proportional to 348.35, 479.51 and 315.55 is: 434.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.35 : 479.51 = 315.55 : x
  2. Step 2: Convert to fraction form
    348.35/479.51 = 315.55/x
  3. Step 3: Cross multiply
    348.35x = 479.51 × 315.55
  4. Step 4: Simplify right side
    348.35x = 151,306.60
  5. Step 5: Solve for x
    x = 151,306.60/348.35
  6. Step 6: Final answer
    x = 434.35

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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.