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Finding the Fourth Proportional to 855.65, 1,284.14 and 393.63

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Solution

The fourth proportional to 855.65, 1,284.14 and 393.63 is: 590.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.65 : 1,284.14 = 393.63 : x
  2. Step 2: Convert to fraction form
    855.65/1,284.14 = 393.63/x
  3. Step 3: Cross multiply
    855.65x = 1,284.14 × 393.63
  4. Step 4: Simplify right side
    855.65x = 505,474.06
  5. Step 5: Solve for x
    x = 505,474.06/855.65
  6. Step 6: Final answer
    x = 590.75

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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.