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Finding the Fourth Proportional to 435.72, 653.78 and 216.57

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Solution

The fourth proportional to 435.72, 653.78 and 216.57 is: 324.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.72 : 653.78 = 216.57 : x
  2. Step 2: Convert to fraction form
    435.72/653.78 = 216.57/x
  3. Step 3: Cross multiply
    435.72x = 653.78 × 216.57
  4. Step 4: Simplify right side
    435.72x = 141,587.84
  5. Step 5: Solve for x
    x = 141,587.84/435.72
  6. Step 6: Final answer
    x = 324.95

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.