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Finding the Fourth Proportional to 8,611.99, 11,880.03 and 7,111.15

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Solution

The fourth proportional to 8,611.99, 11,880.03 and 7,111.15 is: 9,809.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.99 : 11,880.03 = 7,111.15 : x
  2. Step 2: Convert to fraction form
    8,611.99/11,880.03 = 7,111.15/x
  3. Step 3: Cross multiply
    8,611.99x = 11,880.03 × 7,111.15
  4. Step 4: Simplify right side
    8,611.99x = 84,480,675.33
  5. Step 5: Solve for x
    x = 84,480,675.33/8,611.99
  6. Step 6: Final answer
    x = 9,809.66

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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.