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Finding the Fourth Proportional to 464.66, 640.80 and 307.18

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Solution

The fourth proportional to 464.66, 640.80 and 307.18 is: 423.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.66 : 640.80 = 307.18 : x
  2. Step 2: Convert to fraction form
    464.66/640.80 = 307.18/x
  3. Step 3: Cross multiply
    464.66x = 640.80 × 307.18
  4. Step 4: Simplify right side
    464.66x = 196,840.94
  5. Step 5: Solve for x
    x = 196,840.94/464.66
  6. Step 6: Final answer
    x = 423.62

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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.