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Finding the Fourth Proportional to 711.86, 981.99 and 490.43

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Solution

The fourth proportional to 711.86, 981.99 and 490.43 is: 676.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.86 : 981.99 = 490.43 : x
  2. Step 2: Convert to fraction form
    711.86/981.99 = 490.43/x
  3. Step 3: Cross multiply
    711.86x = 981.99 × 490.43
  4. Step 4: Simplify right side
    711.86x = 481,597.36
  5. Step 5: Solve for x
    x = 481,597.36/711.86
  6. Step 6: Final answer
    x = 676.53

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Double scale
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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.