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Finding the Fourth Proportional to 764.88, 1,147.56 and 491.64

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Solution

The fourth proportional to 764.88, 1,147.56 and 491.64 is: 737.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.88 : 1,147.56 = 491.64 : x
  2. Step 2: Convert to fraction form
    764.88/1,147.56 = 491.64/x
  3. Step 3: Cross multiply
    764.88x = 1,147.56 × 491.64
  4. Step 4: Simplify right side
    764.88x = 564,186.40
  5. Step 5: Solve for x
    x = 564,186.40/764.88
  6. Step 6: Final answer
    x = 737.61

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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.