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Finding the Fourth Proportional to 764.86, 1,055.51 and 415.55

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Solution

The fourth proportional to 764.86, 1,055.51 and 415.55 is: 573.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.86 : 1,055.51 = 415.55 : x
  2. Step 2: Convert to fraction form
    764.86/1,055.51 = 415.55/x
  3. Step 3: Cross multiply
    764.86x = 1,055.51 × 415.55
  4. Step 4: Simplify right side
    764.86x = 438,615.70
  5. Step 5: Solve for x
    x = 438,615.70/764.86
  6. Step 6: Final answer
    x = 573.46

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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.