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Finding the Fourth Proportional to 855.95, 1,282.61 and 445.22

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Solution

The fourth proportional to 855.95, 1,282.61 and 445.22 is: 667.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.95 : 1,282.61 = 445.22 : x
  2. Step 2: Convert to fraction form
    855.95/1,282.61 = 445.22/x
  3. Step 3: Cross multiply
    855.95x = 1,282.61 × 445.22
  4. Step 4: Simplify right side
    855.95x = 571,043.62
  5. Step 5: Solve for x
    x = 571,043.62/855.95
  6. Step 6: Final answer
    x = 667.15

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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.