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Finding the Fourth Proportional to 436.92, 655.36 and 128.78

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Solution

The fourth proportional to 436.92, 655.36 and 128.78 is: 193.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.92 : 655.36 = 128.78 : x
  2. Step 2: Convert to fraction form
    436.92/655.36 = 128.78/x
  3. Step 3: Cross multiply
    436.92x = 655.36 × 128.78
  4. Step 4: Simplify right side
    436.92x = 84,397.26
  5. Step 5: Solve for x
    x = 84,397.26/436.92
  6. Step 6: Final answer
    x = 193.16

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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.