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Finding the Fourth Proportional to 8,931.78, 13,318.97 and 8,308.44

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Solution

The fourth proportional to 8,931.78, 13,318.97 and 8,308.44 is: 12,389.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,931.78 : 13,318.97 = 8,308.44 : x
  2. Step 2: Convert to fraction form
    8,931.78/13,318.97 = 8,308.44/x
  3. Step 3: Cross multiply
    8,931.78x = 13,318.97 × 8,308.44
  4. Step 4: Simplify right side
    8,931.78x = 110,659,821.56
  5. Step 5: Solve for x
    x = 110,659,821.56/8,931.78
  6. Step 6: Final answer
    x = 12,389.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.