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Finding the Fourth Proportional to 976.79, 1,348.11 and 622.86

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Solution

The fourth proportional to 976.79, 1,348.11 and 622.86 is: 859.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    976.79 : 1,348.11 = 622.86 : x
  2. Step 2: Convert to fraction form
    976.79/1,348.11 = 622.86/x
  3. Step 3: Cross multiply
    976.79x = 1,348.11 × 622.86
  4. Step 4: Simplify right side
    976.79x = 839,683.79
  5. Step 5: Solve for x
    x = 839,683.79/976.79
  6. Step 6: Final answer
    x = 859.64

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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.