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Finding the Fourth Proportional to 707.18, 975.87 and 396.68

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Solution

The fourth proportional to 707.18, 975.87 and 396.68 is: 547.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    707.18 : 975.87 = 396.68 : x
  2. Step 2: Convert to fraction form
    707.18/975.87 = 396.68/x
  3. Step 3: Cross multiply
    707.18x = 975.87 × 396.68
  4. Step 4: Simplify right side
    707.18x = 387,103.23
  5. Step 5: Solve for x
    x = 387,103.23/707.18
  6. Step 6: Final answer
    x = 547.39

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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.