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Finding the Fourth Proportional to 12,687.65, 19,007.76 and 10,620.94

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Solution

The fourth proportional to 12,687.65, 19,007.76 and 10,620.94 is: 15,911.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.65 : 19,007.76 = 10,620.94 : x
  2. Step 2: Convert to fraction form
    12,687.65/19,007.76 = 10,620.94/x
  3. Step 3: Cross multiply
    12,687.65x = 19,007.76 × 10,620.94
  4. Step 4: Simplify right side
    12,687.65x = 201,880,278.49
  5. Step 5: Solve for x
    x = 201,880,278.49/12,687.65
  6. Step 6: Final answer
    x = 15,911.56

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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.