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Finding the Fourth Proportional to 279.86, 386.21 and 153.82

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Solution

The fourth proportional to 279.86, 386.21 and 153.82 is: 212.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.86 : 386.21 = 153.82 : x
  2. Step 2: Convert to fraction form
    279.86/386.21 = 153.82/x
  3. Step 3: Cross multiply
    279.86x = 386.21 × 153.82
  4. Step 4: Simplify right side
    279.86x = 59,405.09
  5. Step 5: Solve for x
    x = 59,405.09/279.86
  6. Step 6: Final answer
    x = 212.27

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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.