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Finding the Fourth Proportional to 1,081.05, 1,491.80 and 608.99

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Solution

The fourth proportional to 1,081.05, 1,491.80 and 608.99 is: 840.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.05 : 1,491.80 = 608.99 : x
  2. Step 2: Convert to fraction form
    1,081.05/1,491.80 = 608.99/x
  3. Step 3: Cross multiply
    1,081.05x = 1,491.80 × 608.99
  4. Step 4: Simplify right side
    1,081.05x = 908,480.78
  5. Step 5: Solve for x
    x = 908,480.78/1,081.05
  6. Step 6: Final answer
    x = 840.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.