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Finding the Fourth Proportional to 12,891.75, 19,338.75 and 3,657.75

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Solution

The fourth proportional to 12,891.75, 19,338.75 and 3,657.75 is: 5,486.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891.75 : 19,338.75 = 3,657.75 : x
  2. Step 2: Convert to fraction form
    12,891.75/19,338.75 = 3,657.75/x
  3. Step 3: Cross multiply
    12,891.75x = 19,338.75 × 3,657.75
  4. Step 4: Simplify right side
    12,891.75x = 70,736,312.81
  5. Step 5: Solve for x
    x = 70,736,312.81/12,891.75
  6. Step 6: Final answer
    x = 5,486.94

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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.