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Finding the Fourth Proportional to 764.44, 1,145.61 and 398.47

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Solution

The fourth proportional to 764.44, 1,145.61 and 398.47 is: 597.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.44 : 1,145.61 = 398.47 : x
  2. Step 2: Convert to fraction form
    764.44/1,145.61 = 398.47/x
  3. Step 3: Cross multiply
    764.44x = 1,145.61 × 398.47
  4. Step 4: Simplify right side
    764.44x = 456,491.22
  5. Step 5: Solve for x
    x = 456,491.22/764.44
  6. Step 6: Final answer
    x = 597.16

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1.5x scale

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.