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Finding the Fourth Proportional to 1,394, 1,923.78 and 773

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Solution

The fourth proportional to 1,394, 1,923.78 and 773 is: 1,066.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,394 : 1,923.78 = 773 : x
  2. Step 2: Convert to fraction form
    1,394/1,923.78 = 773/x
  3. Step 3: Cross multiply
    1,394x = 1,923.78 × 773
  4. Step 4: Simplify right side
    1,394x = 1,487,081.94
  5. Step 5: Solve for x
    x = 1,487,081.94/1,394
  6. Step 6: Final answer
    x = 1,066.77

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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.