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Finding the Fourth Proportional to 611.39, 843.14 and 471.28

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Solution

The fourth proportional to 611.39, 843.14 and 471.28 is: 649.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    611.39 : 843.14 = 471.28 : x
  2. Step 2: Convert to fraction form
    611.39/843.14 = 471.28/x
  3. Step 3: Cross multiply
    611.39x = 843.14 × 471.28
  4. Step 4: Simplify right side
    611.39x = 397,355.67
  5. Step 5: Solve for x
    x = 397,355.67/611.39
  6. Step 6: Final answer
    x = 649.93

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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.