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Finding the Fourth Proportional to 436.95, 655.54 and 128.81

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Solution

The fourth proportional to 436.95, 655.54 and 128.81 is: 193.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.95 : 655.54 = 128.81 : x
  2. Step 2: Convert to fraction form
    436.95/655.54 = 128.81/x
  3. Step 3: Cross multiply
    436.95x = 655.54 × 128.81
  4. Step 4: Simplify right side
    436.95x = 84,440.11
  5. Step 5: Solve for x
    x = 84,440.11/436.95
  6. Step 6: Final answer
    x = 193.25

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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.