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Finding the Fourth Proportional to 910.89, 1,356.57 and 855

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Solution

The fourth proportional to 910.89, 1,356.57 and 855 is: 1,273.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.89 : 1,356.57 = 855 : x
  2. Step 2: Convert to fraction form
    910.89/1,356.57 = 855/x
  3. Step 3: Cross multiply
    910.89x = 1,356.57 × 855
  4. Step 4: Simplify right side
    910.89x = 1,159,867.35
  5. Step 5: Solve for x
    x = 1,159,867.35/910.89
  6. Step 6: Final answer
    x = 1,273.33

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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.