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Finding the Fourth Proportional to 436.83, 655.31 and 128.71

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Solution

The fourth proportional to 436.83, 655.31 and 128.71 is: 193.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.83 : 655.31 = 128.71 : x
  2. Step 2: Convert to fraction form
    436.83/655.31 = 128.71/x
  3. Step 3: Cross multiply
    436.83x = 655.31 × 128.71
  4. Step 4: Simplify right side
    436.83x = 84,341.03
  5. Step 5: Solve for x
    x = 84,341.03/436.83
  6. Step 6: Final answer
    x = 193.08

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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.