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Finding the Fourth Proportional to 707.82, 976.80 and 393.09

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Solution

The fourth proportional to 707.82, 976.80 and 393.09 is: 542.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.82 : 976.80 = 393.09 : x
  2. Step 2: Convert to fraction form
    707.82/976.80 = 393.09/x
  3. Step 3: Cross multiply
    707.82x = 976.80 × 393.09
  4. Step 4: Simplify right side
    707.82x = 383,968.35
  5. Step 5: Solve for x
    x = 383,968.35/707.82
  6. Step 6: Final answer
    x = 542.47

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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.