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Finding the Fourth Proportional to 279.91, 386.26 and 153.88

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Solution

The fourth proportional to 279.91, 386.26 and 153.88 is: 212.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.91 : 386.26 = 153.88 : x
  2. Step 2: Convert to fraction form
    279.91/386.26 = 153.88/x
  3. Step 3: Cross multiply
    279.91x = 386.26 × 153.88
  4. Step 4: Simplify right side
    279.91x = 59,437.69
  5. Step 5: Solve for x
    x = 59,437.69/279.91
  6. Step 6: Final answer
    x = 212.35

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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.