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Finding the Fourth Proportional to 1,208.78, 1,668.46 and 711.44

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Solution

The fourth proportional to 1,208.78, 1,668.46 and 711.44 is: 981.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.78 : 1,668.46 = 711.44 : x
  2. Step 2: Convert to fraction form
    1,208.78/1,668.46 = 711.44/x
  3. Step 3: Cross multiply
    1,208.78x = 1,668.46 × 711.44
  4. Step 4: Simplify right side
    1,208.78x = 1,187,009.18
  5. Step 5: Solve for x
    x = 1,187,009.18/1,208.78
  6. Step 6: Final answer
    x = 981.99

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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.