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Finding the Fourth Proportional to 348.17, 522.15 and 128.72

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Solution

The fourth proportional to 348.17, 522.15 and 128.72 is: 193.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.17 : 522.15 = 128.72 : x
  2. Step 2: Convert to fraction form
    348.17/522.15 = 128.72/x
  3. Step 3: Cross multiply
    348.17x = 522.15 × 128.72
  4. Step 4: Simplify right side
    348.17x = 67,211.97
  5. Step 5: Solve for x
    x = 67,211.97/348.17
  6. Step 6: Final answer
    x = 193.05

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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.