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Finding the Fourth Proportional to 416.40, 625.02 and 318.66

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Solution

The fourth proportional to 416.40, 625.02 and 318.66 is: 478.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.40 : 625.02 = 318.66 : x
  2. Step 2: Convert to fraction form
    416.40/625.02 = 318.66/x
  3. Step 3: Cross multiply
    416.40x = 625.02 × 318.66
  4. Step 4: Simplify right side
    416.40x = 199,168.87
  5. Step 5: Solve for x
    x = 199,168.87/416.40
  6. Step 6: Final answer
    x = 478.31

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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.