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Finding the Fourth Proportional to 706.49, 975.01 and 391.78

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Solution

The fourth proportional to 706.49, 975.01 and 391.78 is: 540.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    706.49 : 975.01 = 391.78 : x
  2. Step 2: Convert to fraction form
    706.49/975.01 = 391.78/x
  3. Step 3: Cross multiply
    706.49x = 975.01 × 391.78
  4. Step 4: Simplify right side
    706.49x = 381,989.42
  5. Step 5: Solve for x
    x = 381,989.42/706.49
  6. Step 6: Final answer
    x = 540.69

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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.