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Finding the Fourth Proportional to 408.89, 612.53 and 339.67

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Solution

The fourth proportional to 408.89, 612.53 and 339.67 is: 508.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.89 : 612.53 = 339.67 : x
  2. Step 2: Convert to fraction form
    408.89/612.53 = 339.67/x
  3. Step 3: Cross multiply
    408.89x = 612.53 × 339.67
  4. Step 4: Simplify right side
    408.89x = 208,058.07
  5. Step 5: Solve for x
    x = 208,058.07/408.89
  6. Step 6: Final answer
    x = 508.84

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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.