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Finding the Fourth Proportional to 379.74, 523.29 and 309.99

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Solution

The fourth proportional to 379.74, 523.29 and 309.99 is: 427.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.74 : 523.29 = 309.99 : x
  2. Step 2: Convert to fraction form
    379.74/523.29 = 309.99/x
  3. Step 3: Cross multiply
    379.74x = 523.29 × 309.99
  4. Step 4: Simplify right side
    379.74x = 162,214.67
  5. Step 5: Solve for x
    x = 162,214.67/379.74
  6. Step 6: Final answer
    x = 427.17

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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.