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Finding the Fourth Proportional to 764.98, 1,146.10 and 490.39

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Solution

The fourth proportional to 764.98, 1,146.10 and 490.39 is: 734.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.98 : 1,146.10 = 490.39 : x
  2. Step 2: Convert to fraction form
    764.98/1,146.10 = 490.39/x
  3. Step 3: Cross multiply
    764.98x = 1,146.10 × 490.39
  4. Step 4: Simplify right side
    764.98x = 562,035.98
  5. Step 5: Solve for x
    x = 562,035.98/764.98
  6. Step 6: Final answer
    x = 734.71

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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.