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Finding the Fourth Proportional to 768.56, 1,147.08 and 663.96

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Solution

The fourth proportional to 768.56, 1,147.08 and 663.96 is: 990.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.56 : 1,147.08 = 663.96 : x
  2. Step 2: Convert to fraction form
    768.56/1,147.08 = 663.96/x
  3. Step 3: Cross multiply
    768.56x = 1,147.08 × 663.96
  4. Step 4: Simplify right side
    768.56x = 761,615.24
  5. Step 5: Solve for x
    x = 761,615.24/768.56
  6. Step 6: Final answer
    x = 990.96

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.