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Finding the Fourth Proportional to 12,312.85, 18,486.39 and 8,555.78

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Solution

The fourth proportional to 12,312.85, 18,486.39 and 8,555.78 is: 12,845.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,312.85 : 18,486.39 = 8,555.78 : x
  2. Step 2: Convert to fraction form
    12,312.85/18,486.39 = 8,555.78/x
  3. Step 3: Cross multiply
    12,312.85x = 18,486.39 × 8,555.78
  4. Step 4: Simplify right side
    12,312.85x = 158,165,513.97
  5. Step 5: Solve for x
    x = 158,165,513.97/12,312.85
  6. Step 6: Final answer
    x = 12,845.56

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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.