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Finding the Fourth Proportional to 468.64, 645.94 and 398.88

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Solution

The fourth proportional to 468.64, 645.94 and 398.88 is: 549.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    468.64 : 645.94 = 398.88 : x
  2. Step 2: Convert to fraction form
    468.64/645.94 = 398.88/x
  3. Step 3: Cross multiply
    468.64x = 645.94 × 398.88
  4. Step 4: Simplify right side
    468.64x = 257,652.55
  5. Step 5: Solve for x
    x = 257,652.55/468.64
  6. Step 6: Final answer
    x = 549.79

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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.