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Finding the Fourth Proportional to 816.54, 1,132.14 and 772.80

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Solution

The fourth proportional to 816.54, 1,132.14 and 772.80 is: 1,071.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.54 : 1,132.14 = 772.80 : x
  2. Step 2: Convert to fraction form
    816.54/1,132.14 = 772.80/x
  3. Step 3: Cross multiply
    816.54x = 1,132.14 × 772.80
  4. Step 4: Simplify right side
    816.54x = 874,917.79
  5. Step 5: Solve for x
    x = 874,917.79/816.54
  6. Step 6: Final answer
    x = 1,071.49

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.