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Finding the Fourth Proportional to 1,431.36, 1,975.72 and 842

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Solution

The fourth proportional to 1,431.36, 1,975.72 and 842 is: 1,162.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.36 : 1,975.72 = 842 : x
  2. Step 2: Convert to fraction form
    1,431.36/1,975.72 = 842/x
  3. Step 3: Cross multiply
    1,431.36x = 1,975.72 × 842
  4. Step 4: Simplify right side
    1,431.36x = 1,663,556.24
  5. Step 5: Solve for x
    x = 1,663,556.24/1,431.36
  6. Step 6: Final answer
    x = 1,162.22

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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.