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Finding the Fourth Proportional to 279.41, 385.60 and 155.08

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Solution

The fourth proportional to 279.41, 385.60 and 155.08 is: 214.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.41 : 385.60 = 155.08 : x
  2. Step 2: Convert to fraction form
    279.41/385.60 = 155.08/x
  3. Step 3: Cross multiply
    279.41x = 385.60 × 155.08
  4. Step 4: Simplify right side
    279.41x = 59,798.85
  5. Step 5: Solve for x
    x = 59,798.85/279.41
  6. Step 6: Final answer
    x = 214.02

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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.