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Finding the Fourth Proportional to 666.84, 920.99 and 657.73

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Solution

The fourth proportional to 666.84, 920.99 and 657.73 is: 908.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    666.84 : 920.99 = 657.73 : x
  2. Step 2: Convert to fraction form
    666.84/920.99 = 657.73/x
  3. Step 3: Cross multiply
    666.84x = 920.99 × 657.73
  4. Step 4: Simplify right side
    666.84x = 605,762.75
  5. Step 5: Solve for x
    x = 605,762.75/666.84
  6. Step 6: Final answer
    x = 908.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.