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Finding the Fourth Proportional to 464.32, 640.67 and 316.90

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Solution

The fourth proportional to 464.32, 640.67 and 316.90 is: 437.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.32 : 640.67 = 316.90 : x
  2. Step 2: Convert to fraction form
    464.32/640.67 = 316.90/x
  3. Step 3: Cross multiply
    464.32x = 640.67 × 316.90
  4. Step 4: Simplify right side
    464.32x = 203,028.32
  5. Step 5: Solve for x
    x = 203,028.32/464.32
  6. Step 6: Final answer
    x = 437.26

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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.