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Finding the Fourth Proportional to 406.54, 607.10 and 393.99

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Solution

The fourth proportional to 406.54, 607.10 and 393.99 is: 588.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    406.54 : 607.10 = 393.99 : x
  2. Step 2: Convert to fraction form
    406.54/607.10 = 393.99/x
  3. Step 3: Cross multiply
    406.54x = 607.10 × 393.99
  4. Step 4: Simplify right side
    406.54x = 239,191.33
  5. Step 5: Solve for x
    x = 239,191.33/406.54
  6. Step 6: Final answer
    x = 588.36

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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.