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Finding the Fourth Proportional to 464.54, 640.64 and 402.34

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Solution

The fourth proportional to 464.54, 640.64 and 402.34 is: 554.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.54 : 640.64 = 402.34 : x
  2. Step 2: Convert to fraction form
    464.54/640.64 = 402.34/x
  3. Step 3: Cross multiply
    464.54x = 640.64 × 402.34
  4. Step 4: Simplify right side
    464.54x = 257,755.10
  5. Step 5: Solve for x
    x = 257,755.10/464.54
  6. Step 6: Final answer
    x = 554.86

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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.