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Finding the Fourth Proportional to 765.44, 1,146 and 490.86

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Solution

The fourth proportional to 765.44, 1,146 and 490.86 is: 734.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.44 : 1,146 = 490.86 : x
  2. Step 2: Convert to fraction form
    765.44/1,146 = 490.86/x
  3. Step 3: Cross multiply
    765.44x = 1,146 × 490.86
  4. Step 4: Simplify right side
    765.44x = 562,525.56
  5. Step 5: Solve for x
    x = 562,525.56/765.44
  6. Step 6: Final answer
    x = 734.90

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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.