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Finding the Fourth Proportional to 452.52, 678.78 and 127.89

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Solution

The fourth proportional to 452.52, 678.78 and 127.89 is: 191.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.52 : 678.78 = 127.89 : x
  2. Step 2: Convert to fraction form
    452.52/678.78 = 127.89/x
  3. Step 3: Cross multiply
    452.52x = 678.78 × 127.89
  4. Step 4: Simplify right side
    452.52x = 86,809.17
  5. Step 5: Solve for x
    x = 86,809.17/452.52
  6. Step 6: Final answer
    x = 191.84

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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.