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Finding the Fourth Proportional to 855.42, 1,280.85 and 717.42

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Solution

The fourth proportional to 855.42, 1,280.85 and 717.42 is: 1,074.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.42 : 1,280.85 = 717.42 : x
  2. Step 2: Convert to fraction form
    855.42/1,280.85 = 717.42/x
  3. Step 3: Cross multiply
    855.42x = 1,280.85 × 717.42
  4. Step 4: Simplify right side
    855.42x = 918,907.41
  5. Step 5: Solve for x
    x = 918,907.41/855.42
  6. Step 6: Final answer
    x = 1,074.22

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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.