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Finding the Fourth Proportional to 464.66, 640.74 and 398.50

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Solution

The fourth proportional to 464.66, 640.74 and 398.50 is: 549.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.66 : 640.74 = 398.50 : x
  2. Step 2: Convert to fraction form
    464.66/640.74 = 398.50/x
  3. Step 3: Cross multiply
    464.66x = 640.74 × 398.50
  4. Step 4: Simplify right side
    464.66x = 255,333.29
  5. Step 5: Solve for x
    x = 255,333.29/464.66
  6. Step 6: Final answer
    x = 549.51

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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.