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Finding the Fourth Proportional to 436.43, 654.74 and 128.29

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Solution

The fourth proportional to 436.43, 654.74 and 128.29 is: 192.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.43 : 654.74 = 128.29 : x
  2. Step 2: Convert to fraction form
    436.43/654.74 = 128.29/x
  3. Step 3: Cross multiply
    436.43x = 654.74 × 128.29
  4. Step 4: Simplify right side
    436.43x = 83,994.29
  5. Step 5: Solve for x
    x = 83,994.29/436.43
  6. Step 6: Final answer
    x = 192.46

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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.