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Finding the Fourth Proportional to 279.99, 386.38 and 155.65

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Solution

The fourth proportional to 279.99, 386.38 and 155.65 is: 214.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.99 : 386.38 = 155.65 : x
  2. Step 2: Convert to fraction form
    279.99/386.38 = 155.65/x
  3. Step 3: Cross multiply
    279.99x = 386.38 × 155.65
  4. Step 4: Simplify right side
    279.99x = 60,139.27
  5. Step 5: Solve for x
    x = 60,139.27/279.99
  6. Step 6: Final answer
    x = 214.79

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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.