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Finding the Fourth Proportional to 855.67, 1,283.60 and 239.40

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Solution

The fourth proportional to 855.67, 1,283.60 and 239.40 is: 359.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.67 : 1,283.60 = 239.40 : x
  2. Step 2: Convert to fraction form
    855.67/1,283.60 = 239.40/x
  3. Step 3: Cross multiply
    855.67x = 1,283.60 × 239.40
  4. Step 4: Simplify right side
    855.67x = 307,293.84
  5. Step 5: Solve for x
    x = 307,293.84/855.67
  6. Step 6: Final answer
    x = 359.13

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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.