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Finding the Fourth Proportional to 8,691.50, 11,994.19 and 4,915.40

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Solution

The fourth proportional to 8,691.50, 11,994.19 and 4,915.40 is: 6,783.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,691.50 : 11,994.19 = 4,915.40 : x
  2. Step 2: Convert to fraction form
    8,691.50/11,994.19 = 4,915.40/x
  3. Step 3: Cross multiply
    8,691.50x = 11,994.19 × 4,915.40
  4. Step 4: Simplify right side
    8,691.50x = 58,956,241.53
  5. Step 5: Solve for x
    x = 58,956,241.53/8,691.50
  6. Step 6: Final answer
    x = 6,783.21

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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.