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Finding the Fourth Proportional to 1,406.46, 1,940.88 and 776.99

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Solution

The fourth proportional to 1,406.46, 1,940.88 and 776.99 is: 1,072.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.46 : 1,940.88 = 776.99 : x
  2. Step 2: Convert to fraction form
    1,406.46/1,940.88 = 776.99/x
  3. Step 3: Cross multiply
    1,406.46x = 1,940.88 × 776.99
  4. Step 4: Simplify right side
    1,406.46x = 1,508,034.65
  5. Step 5: Solve for x
    x = 1,508,034.65/1,406.46
  6. Step 6: Final answer
    x = 1,072.22

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.