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Finding the Fourth Proportional to 7,143.60, 9,858.06 and 3,999.90

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Solution

The fourth proportional to 7,143.60, 9,858.06 and 3,999.90 is: 5,519.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.60 : 9,858.06 = 3,999.90 : x
  2. Step 2: Convert to fraction form
    7,143.60/9,858.06 = 3,999.90/x
  3. Step 3: Cross multiply
    7,143.60x = 9,858.06 × 3,999.90
  4. Step 4: Simplify right side
    7,143.60x = 39,431,254.19
  5. Step 5: Solve for x
    x = 39,431,254.19/7,143.60
  6. Step 6: Final answer
    x = 5,519.80

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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.