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Finding the Fourth Proportional to 279.98, 386.34 and 155.62

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Solution

The fourth proportional to 279.98, 386.34 and 155.62 is: 214.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.98 : 386.34 = 155.62 : x
  2. Step 2: Convert to fraction form
    279.98/386.34 = 155.62/x
  3. Step 3: Cross multiply
    279.98x = 386.34 × 155.62
  4. Step 4: Simplify right side
    279.98x = 60,122.23
  5. Step 5: Solve for x
    x = 60,122.23/279.98
  6. Step 6: Final answer
    x = 214.74

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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.