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Finding the Fourth Proportional to 418.16, 626.54 and 279.05

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Solution

The fourth proportional to 418.16, 626.54 and 279.05 is: 418.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.16 : 626.54 = 279.05 : x
  2. Step 2: Convert to fraction form
    418.16/626.54 = 279.05/x
  3. Step 3: Cross multiply
    418.16x = 626.54 × 279.05
  4. Step 4: Simplify right side
    418.16x = 174,831.46
  5. Step 5: Solve for x
    x = 174,831.46/418.16
  6. Step 6: Final answer
    x = 418.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.