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Finding the Fourth Proportional to 416.40, 623.40 and 319.56

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Solution

The fourth proportional to 416.40, 623.40 and 319.56 is: 478.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.40 : 623.40 = 319.56 : x
  2. Step 2: Convert to fraction form
    416.40/623.40 = 319.56/x
  3. Step 3: Cross multiply
    416.40x = 623.40 × 319.56
  4. Step 4: Simplify right side
    416.40x = 199,213.70
  5. Step 5: Solve for x
    x = 199,213.70/416.40
  6. Step 6: Final answer
    x = 478.42

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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.