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Finding the Fourth Proportional to 279.40, 416.06 and 272.20

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Solution

The fourth proportional to 279.40, 416.06 and 272.20 is: 405.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.40 : 416.06 = 272.20 : x
  2. Step 2: Convert to fraction form
    279.40/416.06 = 272.20/x
  3. Step 3: Cross multiply
    279.40x = 416.06 × 272.20
  4. Step 4: Simplify right side
    279.40x = 113,251.53
  5. Step 5: Solve for x
    x = 113,251.53/279.40
  6. Step 6: Final answer
    x = 405.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.