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Finding the Fourth Proportional to 8,611.41, 12,899.31 and 7,988.58

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Solution

The fourth proportional to 8,611.41, 12,899.31 and 7,988.58 is: 11,966.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.41 : 12,899.31 = 7,988.58 : x
  2. Step 2: Convert to fraction form
    8,611.41/12,899.31 = 7,988.58/x
  3. Step 3: Cross multiply
    8,611.41x = 12,899.31 × 7,988.58
  4. Step 4: Simplify right side
    8,611.41x = 103,047,169.88
  5. Step 5: Solve for x
    x = 103,047,169.88/8,611.41
  6. Step 6: Final answer
    x = 11,966.35

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.