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Finding the Fourth Proportional to 855.36, 1,283.18 and 393.59

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Solution

The fourth proportional to 855.36, 1,283.18 and 393.59 is: 590.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.36 : 1,283.18 = 393.59 : x
  2. Step 2: Convert to fraction form
    855.36/1,283.18 = 393.59/x
  3. Step 3: Cross multiply
    855.36x = 1,283.18 × 393.59
  4. Step 4: Simplify right side
    855.36x = 505,048.06
  5. Step 5: Solve for x
    x = 505,048.06/855.36
  6. Step 6: Final answer
    x = 590.45

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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.