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Finding the Fourth Proportional to 855.34, 1,283.04 and 393.15

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Solution

The fourth proportional to 855.34, 1,283.04 and 393.15 is: 589.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.34 : 1,283.04 = 393.15 : x
  2. Step 2: Convert to fraction form
    855.34/1,283.04 = 393.15/x
  3. Step 3: Cross multiply
    855.34x = 1,283.04 × 393.15
  4. Step 4: Simplify right side
    855.34x = 504,427.18
  5. Step 5: Solve for x
    x = 504,427.18/855.34
  6. Step 6: Final answer
    x = 589.74

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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.