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Finding the Fourth Proportional to 433.28, 653.18 and 398.72

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Solution

The fourth proportional to 433.28, 653.18 and 398.72 is: 601.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    433.28 : 653.18 = 398.72 : x
  2. Step 2: Convert to fraction form
    433.28/653.18 = 398.72/x
  3. Step 3: Cross multiply
    433.28x = 653.18 × 398.72
  4. Step 4: Simplify right side
    433.28x = 260,435.93
  5. Step 5: Solve for x
    x = 260,435.93/433.28
  6. Step 6: Final answer
    x = 601.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.