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Finding the Fourth Proportional to 11,290.22, 15,571.95 and 9,890.54

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Solution

The fourth proportional to 11,290.22, 15,571.95 and 9,890.54 is: 13,641.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,290.22 : 15,571.95 = 9,890.54 : x
  2. Step 2: Convert to fraction form
    11,290.22/15,571.95 = 9,890.54/x
  3. Step 3: Cross multiply
    11,290.22x = 15,571.95 × 9,890.54
  4. Step 4: Simplify right side
    11,290.22x = 154,014,994.35
  5. Step 5: Solve for x
    x = 154,014,994.35/11,290.22
  6. Step 6: Final answer
    x = 13,641.45

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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.