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Finding the Fourth Proportional to 764.85, 1,055.67 and 450.15

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Solution

The fourth proportional to 764.85, 1,055.67 and 450.15 is: 621.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.85 : 1,055.67 = 450.15 : x
  2. Step 2: Convert to fraction form
    764.85/1,055.67 = 450.15/x
  3. Step 3: Cross multiply
    764.85x = 1,055.67 × 450.15
  4. Step 4: Simplify right side
    764.85x = 475,209.85
  5. Step 5: Solve for x
    x = 475,209.85/764.85
  6. Step 6: Final answer
    x = 621.31

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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.