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Finding the Fourth Proportional to 313.26, 435.28 and 309.88

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Solution

The fourth proportional to 313.26, 435.28 and 309.88 is: 430.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.26 : 435.28 = 309.88 : x
  2. Step 2: Convert to fraction form
    313.26/435.28 = 309.88/x
  3. Step 3: Cross multiply
    313.26x = 435.28 × 309.88
  4. Step 4: Simplify right side
    313.26x = 134,884.57
  5. Step 5: Solve for x
    x = 134,884.57/313.26
  6. Step 6: Final answer
    x = 430.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.