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Finding the Fourth Proportional to 873.14, 1,205.50 and 779.74

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Solution

The fourth proportional to 873.14, 1,205.50 and 779.74 is: 1,076.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.14 : 1,205.50 = 779.74 : x
  2. Step 2: Convert to fraction form
    873.14/1,205.50 = 779.74/x
  3. Step 3: Cross multiply
    873.14x = 1,205.50 × 779.74
  4. Step 4: Simplify right side
    873.14x = 939,976.57
  5. Step 5: Solve for x
    x = 939,976.57/873.14
  6. Step 6: Final answer
    x = 1,076.55

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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.