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Finding the Fourth Proportional to 416.40, 623.66 and 279.11

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Solution

The fourth proportional to 416.40, 623.66 and 279.11 is: 418.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.40 : 623.66 = 279.11 : x
  2. Step 2: Convert to fraction form
    416.40/623.66 = 279.11/x
  3. Step 3: Cross multiply
    416.40x = 623.66 × 279.11
  4. Step 4: Simplify right side
    416.40x = 174,065.23
  5. Step 5: Solve for x
    x = 174,065.23/416.40
  6. Step 6: Final answer
    x = 418.02

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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.