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Finding the Fourth Proportional to 345.18, 513.55 and 331.82

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Solution

The fourth proportional to 345.18, 513.55 and 331.82 is: 493.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.18 : 513.55 = 331.82 : x
  2. Step 2: Convert to fraction form
    345.18/513.55 = 331.82/x
  3. Step 3: Cross multiply
    345.18x = 513.55 × 331.82
  4. Step 4: Simplify right side
    345.18x = 170,403.59
  5. Step 5: Solve for x
    x = 170,403.59/345.18
  6. Step 6: Final answer
    x = 493.67

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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.