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Finding the Fourth Proportional to 416.01, 618.91 and 391.40

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Solution

The fourth proportional to 416.01, 618.91 and 391.40 is: 582.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    416.01 : 618.91 = 391.40 : x
  2. Step 2: Convert to fraction form
    416.01/618.91 = 391.40/x
  3. Step 3: Cross multiply
    416.01x = 618.91 × 391.40
  4. Step 4: Simplify right side
    416.01x = 242,241.37
  5. Step 5: Solve for x
    x = 242,241.37/416.01
  6. Step 6: Final answer
    x = 582.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.