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Finding the Fourth Proportional to 1,442.36, 2,161.72 and 978.99

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Solution

The fourth proportional to 1,442.36, 2,161.72 and 978.99 is: 1,467.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.36 : 2,161.72 = 978.99 : x
  2. Step 2: Convert to fraction form
    1,442.36/2,161.72 = 978.99/x
  3. Step 3: Cross multiply
    1,442.36x = 2,161.72 × 978.99
  4. Step 4: Simplify right side
    1,442.36x = 2,116,286.56
  5. Step 5: Solve for x
    x = 2,116,286.56/1,442.36
  6. Step 6: Final answer
    x = 1,467.24

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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.