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Finding the Fourth Proportional to 855.74, 1,283.63 and 393.91

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Solution

The fourth proportional to 855.74, 1,283.63 and 393.91 is: 590.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.74 : 1,283.63 = 393.91 : x
  2. Step 2: Convert to fraction form
    855.74/1,283.63 = 393.91/x
  3. Step 3: Cross multiply
    855.74x = 1,283.63 × 393.91
  4. Step 4: Simplify right side
    855.74x = 505,630.00
  5. Step 5: Solve for x
    x = 505,630.00/855.74
  6. Step 6: Final answer
    x = 590.87

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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.