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Finding the Fourth Proportional to 356.54, 491.81 and 309.83

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Solution

The fourth proportional to 356.54, 491.81 and 309.83 is: 427.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    356.54 : 491.81 = 309.83 : x
  2. Step 2: Convert to fraction form
    356.54/491.81 = 309.83/x
  3. Step 3: Cross multiply
    356.54x = 491.81 × 309.83
  4. Step 4: Simplify right side
    356.54x = 152,373.48
  5. Step 5: Solve for x
    x = 152,373.48/356.54
  6. Step 6: Final answer
    x = 427.37

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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.