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Finding the Fourth Proportional to 661.77, 992.66 and 418.37

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Solution

The fourth proportional to 661.77, 992.66 and 418.37 is: 627.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.77 : 992.66 = 418.37 : x
  2. Step 2: Convert to fraction form
    661.77/992.66 = 418.37/x
  3. Step 3: Cross multiply
    661.77x = 992.66 × 418.37
  4. Step 4: Simplify right side
    661.77x = 415,292.11
  5. Step 5: Solve for x
    x = 415,292.11/661.77
  6. Step 6: Final answer
    x = 627.55

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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.