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Finding the Fourth Proportional to 764.64, 1,147.60 and 456.80

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Solution

The fourth proportional to 764.64, 1,147.60 and 456.80 is: 685.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.64 : 1,147.60 = 456.80 : x
  2. Step 2: Convert to fraction form
    764.64/1,147.60 = 456.80/x
  3. Step 3: Cross multiply
    764.64x = 1,147.60 × 456.80
  4. Step 4: Simplify right side
    764.64x = 524,223.68
  5. Step 5: Solve for x
    x = 524,223.68/764.64
  6. Step 6: Final answer
    x = 685.58

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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.