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Finding the Fourth Proportional to 8,454.50, 12,681.75 and 7,940.70

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Solution

The fourth proportional to 8,454.50, 12,681.75 and 7,940.70 is: 11,911.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,454.50 : 12,681.75 = 7,940.70 : x
  2. Step 2: Convert to fraction form
    8,454.50/12,681.75 = 7,940.70/x
  3. Step 3: Cross multiply
    8,454.50x = 12,681.75 × 7,940.70
  4. Step 4: Simplify right side
    8,454.50x = 100,701,972.23
  5. Step 5: Solve for x
    x = 100,701,972.23/8,454.50
  6. Step 6: Final answer
    x = 11,911.06

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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.