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Finding the Fourth Proportional to 855.95, 1,284.06 and 336.20

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Solution

The fourth proportional to 855.95, 1,284.06 and 336.20 is: 504.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.95 : 1,284.06 = 336.20 : x
  2. Step 2: Convert to fraction form
    855.95/1,284.06 = 336.20/x
  3. Step 3: Cross multiply
    855.95x = 1,284.06 × 336.20
  4. Step 4: Simplify right side
    855.95x = 431,694.55
  5. Step 5: Solve for x
    x = 431,694.55/855.95
  6. Step 6: Final answer
    x = 504.35

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Double scale
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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.