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Finding the Fourth Proportional to 348.30, 522.42 and 91.80

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Solution

The fourth proportional to 348.30, 522.42 and 91.80 is: 137.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.30 : 522.42 = 91.80 : x
  2. Step 2: Convert to fraction form
    348.30/522.42 = 91.80/x
  3. Step 3: Cross multiply
    348.30x = 522.42 × 91.80
  4. Step 4: Simplify right side
    348.30x = 47,958.16
  5. Step 5: Solve for x
    x = 47,958.16/348.30
  6. Step 6: Final answer
    x = 137.69

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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.