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Finding the Fourth Proportional to 279.69, 385.95 and 155.34

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Solution

The fourth proportional to 279.69, 385.95 and 155.34 is: 214.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.69 : 385.95 = 155.34 : x
  2. Step 2: Convert to fraction form
    279.69/385.95 = 155.34/x
  3. Step 3: Cross multiply
    279.69x = 385.95 × 155.34
  4. Step 4: Simplify right side
    279.69x = 59,953.47
  5. Step 5: Solve for x
    x = 59,953.47/279.69
  6. Step 6: Final answer
    x = 214.36

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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.