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Finding the Fourth Proportional to 512.76, 769.12 and 128

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Solution

The fourth proportional to 512.76, 769.12 and 128 is: 192.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.76 : 769.12 = 128 : x
  2. Step 2: Convert to fraction form
    512.76/769.12 = 128/x
  3. Step 3: Cross multiply
    512.76x = 769.12 × 128
  4. Step 4: Simplify right side
    512.76x = 98,447.36
  5. Step 5: Solve for x
    x = 98,447.36/512.76
  6. Step 6: Final answer
    x = 192.00

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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.