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Finding the Fourth Proportional to 1,391.88, 1,920.75 and 762.42

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Solution

The fourth proportional to 1,391.88, 1,920.75 and 762.42 is: 1,052.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.88 : 1,920.75 = 762.42 : x
  2. Step 2: Convert to fraction form
    1,391.88/1,920.75 = 762.42/x
  3. Step 3: Cross multiply
    1,391.88x = 1,920.75 × 762.42
  4. Step 4: Simplify right side
    1,391.88x = 1,464,418.22
  5. Step 5: Solve for x
    x = 1,464,418.22/1,391.88
  6. Step 6: Final answer
    x = 1,052.12

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1.5x scale

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.