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Finding the Fourth Proportional to 338.16, 468.12 and 309

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Solution

The fourth proportional to 338.16, 468.12 and 309 is: 427.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.16 : 468.12 = 309 : x
  2. Step 2: Convert to fraction form
    338.16/468.12 = 309/x
  3. Step 3: Cross multiply
    338.16x = 468.12 × 309
  4. Step 4: Simplify right side
    338.16x = 144,649.08
  5. Step 5: Solve for x
    x = 144,649.08/338.16
  6. Step 6: Final answer
    x = 427.75

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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.