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Finding the Fourth Proportional to 1,431.80, 1,975.36 and 842.34

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Solution

The fourth proportional to 1,431.80, 1,975.36 and 842.34 is: 1,162.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.80 : 1,975.36 = 842.34 : x
  2. Step 2: Convert to fraction form
    1,431.80/1,975.36 = 842.34/x
  3. Step 3: Cross multiply
    1,431.80x = 1,975.36 × 842.34
  4. Step 4: Simplify right side
    1,431.80x = 1,663,920.10
  5. Step 5: Solve for x
    x = 1,663,920.10/1,431.80
  6. Step 6: Final answer
    x = 1,162.12

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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.