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Finding the Fourth Proportional to 665.51, 991.58 and 628.25

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Solution

The fourth proportional to 665.51, 991.58 and 628.25 is: 936.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.51 : 991.58 = 628.25 : x
  2. Step 2: Convert to fraction form
    665.51/991.58 = 628.25/x
  3. Step 3: Cross multiply
    665.51x = 991.58 × 628.25
  4. Step 4: Simplify right side
    665.51x = 622,956.99
  5. Step 5: Solve for x
    x = 622,956.99/665.51
  6. Step 6: Final answer
    x = 936.06

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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.