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Finding the Fourth Proportional to 8,611.35, 11,878.65 and 5,423.40

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Solution

The fourth proportional to 8,611.35, 11,878.65 and 5,423.40 is: 7,481.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,611.35 : 11,878.65 = 5,423.40 : x
  2. Step 2: Convert to fraction form
    8,611.35/11,878.65 = 5,423.40/x
  3. Step 3: Cross multiply
    8,611.35x = 11,878.65 × 5,423.40
  4. Step 4: Simplify right side
    8,611.35x = 64,422,670.41
  5. Step 5: Solve for x
    x = 64,422,670.41/8,611.35
  6. Step 6: Final answer
    x = 7,481.13

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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.