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Finding the Fourth Proportional to 9,219.78, 12,721.86 and 5,239.98

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Solution

The fourth proportional to 9,219.78, 12,721.86 and 5,239.98 is: 7,230.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,219.78 : 12,721.86 = 5,239.98 : x
  2. Step 2: Convert to fraction form
    9,219.78/12,721.86 = 5,239.98/x
  3. Step 3: Cross multiply
    9,219.78x = 12,721.86 × 5,239.98
  4. Step 4: Simplify right side
    9,219.78x = 66,662,291.96
  5. Step 5: Solve for x
    x = 66,662,291.96/9,219.78
  6. Step 6: Final answer
    x = 7,230.36

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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.