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Finding the Fourth Proportional to 309.21, 426.75 and 210.93

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Solution

The fourth proportional to 309.21, 426.75 and 210.93 is: 291.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.21 : 426.75 = 210.93 : x
  2. Step 2: Convert to fraction form
    309.21/426.75 = 210.93/x
  3. Step 3: Cross multiply
    309.21x = 426.75 × 210.93
  4. Step 4: Simplify right side
    309.21x = 90,014.38
  5. Step 5: Solve for x
    x = 90,014.38/309.21
  6. Step 6: Final answer
    x = 291.11

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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.