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Finding the Fourth Proportional to 452.72, 678.98 and 128

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Solution

The fourth proportional to 452.72, 678.98 and 128 is: 191.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    452.72 : 678.98 = 128 : x
  2. Step 2: Convert to fraction form
    452.72/678.98 = 128/x
  3. Step 3: Cross multiply
    452.72x = 678.98 × 128
  4. Step 4: Simplify right side
    452.72x = 86,909.44
  5. Step 5: Solve for x
    x = 86,909.44/452.72
  6. Step 6: Final answer
    x = 191.97

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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.