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Finding the Fourth Proportional to 309.83, 427.34 and 291.15

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Solution

The fourth proportional to 309.83, 427.34 and 291.15 is: 401.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.83 : 427.34 = 291.15 : x
  2. Step 2: Convert to fraction form
    309.83/427.34 = 291.15/x
  3. Step 3: Cross multiply
    309.83x = 427.34 × 291.15
  4. Step 4: Simplify right side
    309.83x = 124,420.77
  5. Step 5: Solve for x
    x = 124,420.77/309.83
  6. Step 6: Final answer
    x = 401.58

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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.