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Finding the Fourth Proportional to 1,405.94, 1,940.21 and 776.49

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Solution

The fourth proportional to 1,405.94, 1,940.21 and 776.49 is: 1,071.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.94 : 1,940.21 = 776.49 : x
  2. Step 2: Convert to fraction form
    1,405.94/1,940.21 = 776.49/x
  3. Step 3: Cross multiply
    1,405.94x = 1,940.21 × 776.49
  4. Step 4: Simplify right side
    1,405.94x = 1,506,553.66
  5. Step 5: Solve for x
    x = 1,506,553.66/1,405.94
  6. Step 6: Final answer
    x = 1,071.56

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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.