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Finding the Fourth Proportional to 653.78, 902.21 and 359.05

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Solution

The fourth proportional to 653.78, 902.21 and 359.05 is: 495.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.78 : 902.21 = 359.05 : x
  2. Step 2: Convert to fraction form
    653.78/902.21 = 359.05/x
  3. Step 3: Cross multiply
    653.78x = 902.21 × 359.05
  4. Step 4: Simplify right side
    653.78x = 323,938.50
  5. Step 5: Solve for x
    x = 323,938.50/653.78
  6. Step 6: Final answer
    x = 495.49

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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.