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Finding the Fourth Proportional to 855.08, 1,281.42 and 391.72

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Solution

The fourth proportional to 855.08, 1,281.42 and 391.72 is: 587.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.08 : 1,281.42 = 391.72 : x
  2. Step 2: Convert to fraction form
    855.08/1,281.42 = 391.72/x
  3. Step 3: Cross multiply
    855.08x = 1,281.42 × 391.72
  4. Step 4: Simplify right side
    855.08x = 501,957.84
  5. Step 5: Solve for x
    x = 501,957.84/855.08
  6. Step 6: Final answer
    x = 587.03

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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.