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Finding the Fourth Proportional to 707.36, 976.16 and 396.86

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Solution

The fourth proportional to 707.36, 976.16 and 396.86 is: 547.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.36 : 976.16 = 396.86 : x
  2. Step 2: Convert to fraction form
    707.36/976.16 = 396.86/x
  3. Step 3: Cross multiply
    707.36x = 976.16 × 396.86
  4. Step 4: Simplify right side
    707.36x = 387,398.86
  5. Step 5: Solve for x
    x = 387,398.86/707.36
  6. Step 6: Final answer
    x = 547.67

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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.