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Finding the Fourth Proportional to 906.39, 1,360.80 and 855.36

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Solution

The fourth proportional to 906.39, 1,360.80 and 855.36 is: 1,284.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    906.39 : 1,360.80 = 855.36 : x
  2. Step 2: Convert to fraction form
    906.39/1,360.80 = 855.36/x
  3. Step 3: Cross multiply
    906.39x = 1,360.80 × 855.36
  4. Step 4: Simplify right side
    906.39x = 1,163,973.89
  5. Step 5: Solve for x
    x = 1,163,973.89/906.39
  6. Step 6: Final answer
    x = 1,284.19

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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.