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Finding the Fourth Proportional to 1,292.84, 1,936.24 and 945.31

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Solution

The fourth proportional to 1,292.84, 1,936.24 and 945.31 is: 1,415.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.84 : 1,936.24 = 945.31 : x
  2. Step 2: Convert to fraction form
    1,292.84/1,936.24 = 945.31/x
  3. Step 3: Cross multiply
    1,292.84x = 1,936.24 × 945.31
  4. Step 4: Simplify right side
    1,292.84x = 1,830,347.03
  5. Step 5: Solve for x
    x = 1,830,347.03/1,292.84
  6. Step 6: Final answer
    x = 1,415.76

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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.