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Finding the Fourth Proportional to 661.86, 992.43 and 490.50

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Solution

The fourth proportional to 661.86, 992.43 and 490.50 is: 735.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.86 : 992.43 = 490.50 : x
  2. Step 2: Convert to fraction form
    661.86/992.43 = 490.50/x
  3. Step 3: Cross multiply
    661.86x = 992.43 × 490.50
  4. Step 4: Simplify right side
    661.86x = 486,786.92
  5. Step 5: Solve for x
    x = 486,786.92/661.86
  6. Step 6: Final answer
    x = 735.48

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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.