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Finding the Fourth Proportional to 1,008.10, 1,391.34 and 942.22

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Solution

The fourth proportional to 1,008.10, 1,391.34 and 942.22 is: 1,300.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.10 : 1,391.34 = 942.22 : x
  2. Step 2: Convert to fraction form
    1,008.10/1,391.34 = 942.22/x
  3. Step 3: Cross multiply
    1,008.10x = 1,391.34 × 942.22
  4. Step 4: Simplify right side
    1,008.10x = 1,310,948.37
  5. Step 5: Solve for x
    x = 1,310,948.37/1,008.10
  6. Step 6: Final answer
    x = 1,300.42

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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.