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Finding the Fourth Proportional to 348.45, 521.80 and 342.78

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Solution

The fourth proportional to 348.45, 521.80 and 342.78 is: 513.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.45 : 521.80 = 342.78 : x
  2. Step 2: Convert to fraction form
    348.45/521.80 = 342.78/x
  3. Step 3: Cross multiply
    348.45x = 521.80 × 342.78
  4. Step 4: Simplify right side
    348.45x = 178,862.60
  5. Step 5: Solve for x
    x = 178,862.60/348.45
  6. Step 6: Final answer
    x = 513.31

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.