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Finding the Fourth Proportional to 820.53, 1,231.40 and 713.61

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Solution

The fourth proportional to 820.53, 1,231.40 and 713.61 is: 1,070.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    820.53 : 1,231.40 = 713.61 : x
  2. Step 2: Convert to fraction form
    820.53/1,231.40 = 713.61/x
  3. Step 3: Cross multiply
    820.53x = 1,231.40 × 713.61
  4. Step 4: Simplify right side
    820.53x = 878,741.14
  5. Step 5: Solve for x
    x = 878,741.14/820.53
  6. Step 6: Final answer
    x = 1,070.94

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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.