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Finding the Fourth Proportional to 764.91, 1,055.58 and 415.60

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Solution

The fourth proportional to 764.91, 1,055.58 and 415.60 is: 573.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.91 : 1,055.58 = 415.60 : x
  2. Step 2: Convert to fraction form
    764.91/1,055.58 = 415.60/x
  3. Step 3: Cross multiply
    764.91x = 1,055.58 × 415.60
  4. Step 4: Simplify right side
    764.91x = 438,696.41
  5. Step 5: Solve for x
    x = 438,696.41/764.91
  6. Step 6: Final answer
    x = 573.53

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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.