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Finding the Fourth Proportional to 8,672.80, 12,980.40 and 7,981.60

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Solution

The fourth proportional to 8,672.80, 12,980.40 and 7,981.60 is: 11,945.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672.80 : 12,980.40 = 7,981.60 : x
  2. Step 2: Convert to fraction form
    8,672.80/12,980.40 = 7,981.60/x
  3. Step 3: Cross multiply
    8,672.80x = 12,980.40 × 7,981.60
  4. Step 4: Simplify right side
    8,672.80x = 103,604,360.64
  5. Step 5: Solve for x
    x = 103,604,360.64/8,672.80
  6. Step 6: Final answer
    x = 11,945.90

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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.