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Finding the Fourth Proportional to 855.65, 1,281.16 and 443.93

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Solution

The fourth proportional to 855.65, 1,281.16 and 443.93 is: 664.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.65 : 1,281.16 = 443.93 : x
  2. Step 2: Convert to fraction form
    855.65/1,281.16 = 443.93/x
  3. Step 3: Cross multiply
    855.65x = 1,281.16 × 443.93
  4. Step 4: Simplify right side
    855.65x = 568,737.84
  5. Step 5: Solve for x
    x = 568,737.84/855.65
  6. Step 6: Final answer
    x = 664.68

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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.