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Finding the Fourth Proportional to 764.22, 1,055 and 515.86

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Solution

The fourth proportional to 764.22, 1,055 and 515.86 is: 712.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.22 : 1,055 = 515.86 : x
  2. Step 2: Convert to fraction form
    764.22/1,055 = 515.86/x
  3. Step 3: Cross multiply
    764.22x = 1,055 × 515.86
  4. Step 4: Simplify right side
    764.22x = 544,232.30
  5. Step 5: Solve for x
    x = 544,232.30/764.22
  6. Step 6: Final answer
    x = 712.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.