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Finding the Fourth Proportional to 656.21, 985.40 and 401.33

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Solution

The fourth proportional to 656.21, 985.40 and 401.33 is: 602.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    656.21 : 985.40 = 401.33 : x
  2. Step 2: Convert to fraction form
    656.21/985.40 = 401.33/x
  3. Step 3: Cross multiply
    656.21x = 985.40 × 401.33
  4. Step 4: Simplify right side
    656.21x = 395,470.58
  5. Step 5: Solve for x
    x = 395,470.58/656.21
  6. Step 6: Final answer
    x = 602.66

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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.