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Finding the Fourth Proportional to 8,920.78, 12,272.94 and 8,674.74

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Solution

The fourth proportional to 8,920.78, 12,272.94 and 8,674.74 is: 11,934.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.78 : 12,272.94 = 8,674.74 : x
  2. Step 2: Convert to fraction form
    8,920.78/12,272.94 = 8,674.74/x
  3. Step 3: Cross multiply
    8,920.78x = 12,272.94 × 8,674.74
  4. Step 4: Simplify right side
    8,920.78x = 106,464,563.54
  5. Step 5: Solve for x
    x = 106,464,563.54/8,920.78
  6. Step 6: Final answer
    x = 11,934.45

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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.