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Finding the Fourth Proportional to 12,811.29, 19,208.65 and 8,851.49

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Solution

The fourth proportional to 12,811.29, 19,208.65 and 8,851.49 is: 13,271.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.29 : 19,208.65 = 8,851.49 : x
  2. Step 2: Convert to fraction form
    12,811.29/19,208.65 = 8,851.49/x
  3. Step 3: Cross multiply
    12,811.29x = 19,208.65 × 8,851.49
  4. Step 4: Simplify right side
    12,811.29x = 170,025,173.39
  5. Step 5: Solve for x
    x = 170,025,173.39/12,811.29
  6. Step 6: Final answer
    x = 13,271.51

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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.