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Finding the Fourth Proportional to 711.03, 981 and 490.53

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Solution

The fourth proportional to 711.03, 981 and 490.53 is: 676.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.03 : 981 = 490.53 : x
  2. Step 2: Convert to fraction form
    711.03/981 = 490.53/x
  3. Step 3: Cross multiply
    711.03x = 981 × 490.53
  4. Step 4: Simplify right side
    711.03x = 481,209.93
  5. Step 5: Solve for x
    x = 481,209.93/711.03
  6. Step 6: Final answer
    x = 676.78

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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.