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Finding the Fourth Proportional to 829.40, 1,146.03 and 620.42

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Solution

The fourth proportional to 829.40, 1,146.03 and 620.42 is: 857.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.40 : 1,146.03 = 620.42 : x
  2. Step 2: Convert to fraction form
    829.40/1,146.03 = 620.42/x
  3. Step 3: Cross multiply
    829.40x = 1,146.03 × 620.42
  4. Step 4: Simplify right side
    829.40x = 711,019.93
  5. Step 5: Solve for x
    x = 711,019.93/829.40
  6. Step 6: Final answer
    x = 857.27

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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.