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Finding the Fourth Proportional to 9,889.70, 13,647.79 and 5,413.45

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Solution

The fourth proportional to 9,889.70, 13,647.79 and 5,413.45 is: 7,470.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,889.70 : 13,647.79 = 5,413.45 : x
  2. Step 2: Convert to fraction form
    9,889.70/13,647.79 = 5,413.45/x
  3. Step 3: Cross multiply
    9,889.70x = 13,647.79 × 5,413.45
  4. Step 4: Simplify right side
    9,889.70x = 73,881,628.78
  5. Step 5: Solve for x
    x = 73,881,628.78/9,889.70
  6. Step 6: Final answer
    x = 7,470.56

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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.