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Finding the Fourth Proportional to 706.72, 975.15 and 391.99

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Solution

The fourth proportional to 706.72, 975.15 and 391.99 is: 540.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.72 : 975.15 = 391.99 : x
  2. Step 2: Convert to fraction form
    706.72/975.15 = 391.99/x
  3. Step 3: Cross multiply
    706.72x = 975.15 × 391.99
  4. Step 4: Simplify right side
    706.72x = 382,249.05
  5. Step 5: Solve for x
    x = 382,249.05/706.72
  6. Step 6: Final answer
    x = 540.88

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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.