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Finding the Fourth Proportional to 348.55, 522.80 and 129.17

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Solution

The fourth proportional to 348.55, 522.80 and 129.17 is: 193.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.55 : 522.80 = 129.17 : x
  2. Step 2: Convert to fraction form
    348.55/522.80 = 129.17/x
  3. Step 3: Cross multiply
    348.55x = 522.80 × 129.17
  4. Step 4: Simplify right side
    348.55x = 67,530.48
  5. Step 5: Solve for x
    x = 67,530.48/348.55
  6. Step 6: Final answer
    x = 193.75

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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.