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Finding the Fourth Proportional to 416.88, 626.47 and 389.79

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Solution

The fourth proportional to 416.88, 626.47 and 389.79 is: 585.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.88 : 626.47 = 389.79 : x
  2. Step 2: Convert to fraction form
    416.88/626.47 = 389.79/x
  3. Step 3: Cross multiply
    416.88x = 626.47 × 389.79
  4. Step 4: Simplify right side
    416.88x = 244,190.77
  5. Step 5: Solve for x
    x = 244,190.77/416.88
  6. Step 6: Final answer
    x = 585.76

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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.