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Finding the Fourth Proportional to 436.88, 655.38 and 128.70

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Solution

The fourth proportional to 436.88, 655.38 and 128.70 is: 193.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.88 : 655.38 = 128.70 : x
  2. Step 2: Convert to fraction form
    436.88/655.38 = 128.70/x
  3. Step 3: Cross multiply
    436.88x = 655.38 × 128.70
  4. Step 4: Simplify right side
    436.88x = 84,347.41
  5. Step 5: Solve for x
    x = 84,347.41/436.88
  6. Step 6: Final answer
    x = 193.07

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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.