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Finding the Fourth Proportional to 3,894.48, 5,842.40 and 1,431

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Solution

The fourth proportional to 3,894.48, 5,842.40 and 1,431 is: 2,146.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,894.48 : 5,842.40 = 1,431 : x
  2. Step 2: Convert to fraction form
    3,894.48/5,842.40 = 1,431/x
  3. Step 3: Cross multiply
    3,894.48x = 5,842.40 × 1,431
  4. Step 4: Simplify right side
    3,894.48x = 8,360,467.25
  5. Step 5: Solve for x
    x = 8,360,467.25/3,894.48
  6. Step 6: Final answer
    x = 2,146.75

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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.