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Finding the Fourth Proportional to 855.78, 1,282.86 and 278.25

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Solution

The fourth proportional to 855.78, 1,282.86 and 278.25 is: 417.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.78 : 1,282.86 = 278.25 : x
  2. Step 2: Convert to fraction form
    855.78/1,282.86 = 278.25/x
  3. Step 3: Cross multiply
    855.78x = 1,282.86 × 278.25
  4. Step 4: Simplify right side
    855.78x = 356,955.80
  5. Step 5: Solve for x
    x = 356,955.80/855.78
  6. Step 6: Final answer
    x = 417.11

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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.