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Finding the Fourth Proportional to 7,143.85, 9,858.29 and 3,957.29

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Solution

The fourth proportional to 7,143.85, 9,858.29 and 3,957.29 is: 5,460.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.85 : 9,858.29 = 3,957.29 : x
  2. Step 2: Convert to fraction form
    7,143.85/9,858.29 = 3,957.29/x
  3. Step 3: Cross multiply
    7,143.85x = 9,858.29 × 3,957.29
  4. Step 4: Simplify right side
    7,143.85x = 39,012,112.43
  5. Step 5: Solve for x
    x = 39,012,112.43/7,143.85
  6. Step 6: Final answer
    x = 5,460.94

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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.