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Finding the Fourth Proportional to 711.23, 981.46 and 490.17

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Solution

The fourth proportional to 711.23, 981.46 and 490.17 is: 676.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    711.23 : 981.46 = 490.17 : x
  2. Step 2: Convert to fraction form
    711.23/981.46 = 490.17/x
  3. Step 3: Cross multiply
    711.23x = 981.46 × 490.17
  4. Step 4: Simplify right side
    711.23x = 481,082.25
  5. Step 5: Solve for x
    x = 481,082.25/711.23
  6. Step 6: Final answer
    x = 676.41

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.