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Finding the Fourth Proportional to 464.60, 640.95 and 307.31

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Solution

The fourth proportional to 464.60, 640.95 and 307.31 is: 423.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.60 : 640.95 = 307.31 : x
  2. Step 2: Convert to fraction form
    464.60/640.95 = 307.31/x
  3. Step 3: Cross multiply
    464.60x = 640.95 × 307.31
  4. Step 4: Simplify right side
    464.60x = 196,967.14
  5. Step 5: Solve for x
    x = 196,967.14/464.60
  6. Step 6: Final answer
    x = 423.95

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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.