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Finding the Fourth Proportional to 9,889.78, 13,646.56 and 5,697.22

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Solution

The fourth proportional to 9,889.78, 13,646.56 and 5,697.22 is: 7,861.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,889.78 : 13,646.56 = 5,697.22 : x
  2. Step 2: Convert to fraction form
    9,889.78/13,646.56 = 5,697.22/x
  3. Step 3: Cross multiply
    9,889.78x = 13,646.56 × 5,697.22
  4. Step 4: Simplify right side
    9,889.78x = 77,747,454.56
  5. Step 5: Solve for x
    x = 77,747,454.56/9,889.78
  6. Step 6: Final answer
    x = 7,861.39

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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.