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Finding the Fourth Proportional to 764.69, 1,055.27 and 415.38

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Solution

The fourth proportional to 764.69, 1,055.27 and 415.38 is: 573.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.69 : 1,055.27 = 415.38 : x
  2. Step 2: Convert to fraction form
    764.69/1,055.27 = 415.38/x
  3. Step 3: Cross multiply
    764.69x = 1,055.27 × 415.38
  4. Step 4: Simplify right side
    764.69x = 438,338.05
  5. Step 5: Solve for x
    x = 438,338.05/764.69
  6. Step 6: Final answer
    x = 573.22

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1.5x scale

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.