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Finding the Fourth Proportional to 906.95, 1,354.25 and 855.61

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Solution

The fourth proportional to 906.95, 1,354.25 and 855.61 is: 1,277.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.95 : 1,354.25 = 855.61 : x
  2. Step 2: Convert to fraction form
    906.95/1,354.25 = 855.61/x
  3. Step 3: Cross multiply
    906.95x = 1,354.25 × 855.61
  4. Step 4: Simplify right side
    906.95x = 1,158,709.84
  5. Step 5: Solve for x
    x = 1,158,709.84/906.95
  6. Step 6: Final answer
    x = 1,277.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.