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Finding the Fourth Proportional to 855.35, 1,283.12 and 278.09

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Solution

The fourth proportional to 855.35, 1,283.12 and 278.09 is: 417.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.35 : 1,283.12 = 278.09 : x
  2. Step 2: Convert to fraction form
    855.35/1,283.12 = 278.09/x
  3. Step 3: Cross multiply
    855.35x = 1,283.12 × 278.09
  4. Step 4: Simplify right side
    855.35x = 356,821.45
  5. Step 5: Solve for x
    x = 356,821.45/855.35
  6. Step 6: Final answer
    x = 417.16

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1.5x scale

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.