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Finding the Fourth Proportional to 464.68, 640.98 and 309.64

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Solution

The fourth proportional to 464.68, 640.98 and 309.64 is: 427.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.68 : 640.98 = 309.64 : x
  2. Step 2: Convert to fraction form
    464.68/640.98 = 309.64/x
  3. Step 3: Cross multiply
    464.68x = 640.98 × 309.64
  4. Step 4: Simplify right side
    464.68x = 198,473.05
  5. Step 5: Solve for x
    x = 198,473.05/464.68
  6. Step 6: Final answer
    x = 427.12

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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.