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Finding the Fourth Proportional to 768.76, 1,152.99 and 221.00

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Solution

The fourth proportional to 768.76, 1,152.99 and 221.00 is: 331.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.76 : 1,152.99 = 221.00 : x
  2. Step 2: Convert to fraction form
    768.76/1,152.99 = 221.00/x
  3. Step 3: Cross multiply
    768.76x = 1,152.99 × 221.00
  4. Step 4: Simplify right side
    768.76x = 254,805.03
  5. Step 5: Solve for x
    x = 254,805.03/768.76
  6. Step 6: Final answer
    x = 331.45

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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.