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Finding the Fourth Proportional to 348.78, 519.64 and 345.36

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Solution

The fourth proportional to 348.78, 519.64 and 345.36 is: 514.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.78 : 519.64 = 345.36 : x
  2. Step 2: Convert to fraction form
    348.78/519.64 = 345.36/x
  3. Step 3: Cross multiply
    348.78x = 519.64 × 345.36
  4. Step 4: Simplify right side
    348.78x = 179,462.87
  5. Step 5: Solve for x
    x = 179,462.87/348.78
  6. Step 6: Final answer
    x = 514.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.