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Finding the Fourth Proportional to 855.44, 1,283.64 and 790.16

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Solution

The fourth proportional to 855.44, 1,283.64 and 790.16 is: 1,185.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.44 : 1,283.64 = 790.16 : x
  2. Step 2: Convert to fraction form
    855.44/1,283.64 = 790.16/x
  3. Step 3: Cross multiply
    855.44x = 1,283.64 × 790.16
  4. Step 4: Simplify right side
    855.44x = 1,014,280.98
  5. Step 5: Solve for x
    x = 1,014,280.98/855.44
  6. Step 6: Final answer
    x = 1,185.68

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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.