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Finding the Fourth Proportional to 7,143.78, 9,858.36 and 4,000.56

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Solution

The fourth proportional to 7,143.78, 9,858.36 and 4,000.56 is: 5,520.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.78 : 9,858.36 = 4,000.56 : x
  2. Step 2: Convert to fraction form
    7,143.78/9,858.36 = 4,000.56/x
  3. Step 3: Cross multiply
    7,143.78x = 9,858.36 × 4,000.56
  4. Step 4: Simplify right side
    7,143.78x = 39,438,960.68
  5. Step 5: Solve for x
    x = 39,438,960.68/7,143.78
  6. Step 6: Final answer
    x = 5,520.74

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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.