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Finding the Fourth Proportional to 764.80, 1,149.12 and 440.32

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Solution

The fourth proportional to 764.80, 1,149.12 and 440.32 is: 661.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.80 : 1,149.12 = 440.32 : x
  2. Step 2: Convert to fraction form
    764.80/1,149.12 = 440.32/x
  3. Step 3: Cross multiply
    764.80x = 1,149.12 × 440.32
  4. Step 4: Simplify right side
    764.80x = 505,980.52
  5. Step 5: Solve for x
    x = 505,980.52/764.80
  6. Step 6: Final answer
    x = 661.59

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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.