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Finding the Fourth Proportional to 1,195.22, 1,647.71 and 840.07

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Solution

The fourth proportional to 1,195.22, 1,647.71 and 840.07 is: 1,158.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,195.22 : 1,647.71 = 840.07 : x
  2. Step 2: Convert to fraction form
    1,195.22/1,647.71 = 840.07/x
  3. Step 3: Cross multiply
    1,195.22x = 1,647.71 × 840.07
  4. Step 4: Simplify right side
    1,195.22x = 1,384,192.75
  5. Step 5: Solve for x
    x = 1,384,192.75/1,195.22
  6. Step 6: Final answer
    x = 1,158.10

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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.