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Finding the Fourth Proportional to 707.92, 976.90 and 393.20

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Solution

The fourth proportional to 707.92, 976.90 and 393.20 is: 542.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.92 : 976.90 = 393.20 : x
  2. Step 2: Convert to fraction form
    707.92/976.90 = 393.20/x
  3. Step 3: Cross multiply
    707.92x = 976.90 × 393.20
  4. Step 4: Simplify right side
    707.92x = 384,110.23
  5. Step 5: Solve for x
    x = 384,110.23/707.92
  6. Step 6: Final answer
    x = 542.59

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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.