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Finding the Fourth Proportional to 855.89, 1,283.56 and 278.63

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Solution

The fourth proportional to 855.89, 1,283.56 and 278.63 is: 417.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.89 : 1,283.56 = 278.63 : x
  2. Step 2: Convert to fraction form
    855.89/1,283.56 = 278.63/x
  3. Step 3: Cross multiply
    855.89x = 1,283.56 × 278.63
  4. Step 4: Simplify right side
    855.89x = 357,631.21
  5. Step 5: Solve for x
    x = 357,631.21/855.89
  6. Step 6: Final answer
    x = 417.85

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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.