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Finding the Fourth Proportional to 368.89, 509.05 and 213.61

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Solution

The fourth proportional to 368.89, 509.05 and 213.61 is: 294.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    368.89 : 509.05 = 213.61 : x
  2. Step 2: Convert to fraction form
    368.89/509.05 = 213.61/x
  3. Step 3: Cross multiply
    368.89x = 509.05 × 213.61
  4. Step 4: Simplify right side
    368.89x = 108,738.17
  5. Step 5: Solve for x
    x = 108,738.17/368.89
  6. Step 6: Final answer
    x = 294.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.