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Finding the Fourth Proportional to 435.78, 653.16 and 191.79

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Solution

The fourth proportional to 435.78, 653.16 and 191.79 is: 287.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    435.78 : 653.16 = 191.79 : x
  2. Step 2: Convert to fraction form
    435.78/653.16 = 191.79/x
  3. Step 3: Cross multiply
    435.78x = 653.16 × 191.79
  4. Step 4: Simplify right side
    435.78x = 125,269.56
  5. Step 5: Solve for x
    x = 125,269.56/435.78
  6. Step 6: Final answer
    x = 287.46

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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.