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Finding the Fourth Proportional to 848.09, 1,271.28 and 408.71

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Solution

The fourth proportional to 848.09, 1,271.28 and 408.71 is: 612.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    848.09 : 1,271.28 = 408.71 : x
  2. Step 2: Convert to fraction form
    848.09/1,271.28 = 408.71/x
  3. Step 3: Cross multiply
    848.09x = 1,271.28 × 408.71
  4. Step 4: Simplify right side
    848.09x = 519,584.85
  5. Step 5: Solve for x
    x = 519,584.85/848.09
  6. Step 6: Final answer
    x = 612.65

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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.