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Finding the Fourth Proportional to 850.79, 1,174.21 and 477.81

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Solution

The fourth proportional to 850.79, 1,174.21 and 477.81 is: 659.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.79 : 1,174.21 = 477.81 : x
  2. Step 2: Convert to fraction form
    850.79/1,174.21 = 477.81/x
  3. Step 3: Cross multiply
    850.79x = 1,174.21 × 477.81
  4. Step 4: Simplify right side
    850.79x = 561,048.09
  5. Step 5: Solve for x
    x = 561,048.09/850.79
  6. Step 6: Final answer
    x = 659.45

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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.