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Finding the Fourth Proportional to 314.55, 434.97 and 309.69

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Solution

The fourth proportional to 314.55, 434.97 and 309.69 is: 428.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.55 : 434.97 = 309.69 : x
  2. Step 2: Convert to fraction form
    314.55/434.97 = 309.69/x
  3. Step 3: Cross multiply
    314.55x = 434.97 × 309.69
  4. Step 4: Simplify right side
    314.55x = 134,705.86
  5. Step 5: Solve for x
    x = 134,705.86/314.55
  6. Step 6: Final answer
    x = 428.25

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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.