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Finding the Fourth Proportional to 279.36, 417.39 and 207.24

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Solution

The fourth proportional to 279.36, 417.39 and 207.24 is: 309.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    279.36 : 417.39 = 207.24 : x
  2. Step 2: Convert to fraction form
    279.36/417.39 = 207.24/x
  3. Step 3: Cross multiply
    279.36x = 417.39 × 207.24
  4. Step 4: Simplify right side
    279.36x = 86,499.90
  5. Step 5: Solve for x
    x = 86,499.90/279.36
  6. Step 6: Final answer
    x = 309.64

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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.