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Finding the Fourth Proportional to 820.56, 1,131.42 and 762.24

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Solution

The fourth proportional to 820.56, 1,131.42 and 762.24 is: 1,051.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.56 : 1,131.42 = 762.24 : x
  2. Step 2: Convert to fraction form
    820.56/1,131.42 = 762.24/x
  3. Step 3: Cross multiply
    820.56x = 1,131.42 × 762.24
  4. Step 4: Simplify right side
    820.56x = 862,413.58
  5. Step 5: Solve for x
    x = 862,413.58/820.56
  6. Step 6: Final answer
    x = 1,051.01

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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.