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Finding the Fourth Proportional to 661.67, 992.51 and 199.45

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Solution

The fourth proportional to 661.67, 992.51 and 199.45 is: 299.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.67 : 992.51 = 199.45 : x
  2. Step 2: Convert to fraction form
    661.67/992.51 = 199.45/x
  3. Step 3: Cross multiply
    661.67x = 992.51 × 199.45
  4. Step 4: Simplify right side
    661.67x = 197,950.16
  5. Step 5: Solve for x
    x = 197,950.16/661.67
  6. Step 6: Final answer
    x = 299.17

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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.