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Finding the Fourth Proportional to 279.65, 385.87 and 155.32

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Solution

The fourth proportional to 279.65, 385.87 and 155.32 is: 214.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.65 : 385.87 = 155.32 : x
  2. Step 2: Convert to fraction form
    279.65/385.87 = 155.32/x
  3. Step 3: Cross multiply
    279.65x = 385.87 × 155.32
  4. Step 4: Simplify right side
    279.65x = 59,933.33
  5. Step 5: Solve for x
    x = 59,933.33/279.65
  6. Step 6: Final answer
    x = 214.32

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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.