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Finding the Fourth Proportional to 451.84, 677.76 and 127.20

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Solution

The fourth proportional to 451.84, 677.76 and 127.20 is: 190.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.84 : 677.76 = 127.20 : x
  2. Step 2: Convert to fraction form
    451.84/677.76 = 127.20/x
  3. Step 3: Cross multiply
    451.84x = 677.76 × 127.20
  4. Step 4: Simplify right side
    451.84x = 86,211.07
  5. Step 5: Solve for x
    x = 86,211.07/451.84
  6. Step 6: Final answer
    x = 190.80

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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.