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Finding the Fourth Proportional to 464.19, 640.40 and 345.96

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Solution

The fourth proportional to 464.19, 640.40 and 345.96 is: 477.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.19 : 640.40 = 345.96 : x
  2. Step 2: Convert to fraction form
    464.19/640.40 = 345.96/x
  3. Step 3: Cross multiply
    464.19x = 640.40 × 345.96
  4. Step 4: Simplify right side
    464.19x = 221,551.05
  5. Step 5: Solve for x
    x = 221,551.05/464.19
  6. Step 6: Final answer
    x = 477.29

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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.