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Finding the Fourth Proportional to 764.63, 1,055.21 and 415.34

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Solution

The fourth proportional to 764.63, 1,055.21 and 415.34 is: 573.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.63 : 1,055.21 = 415.34 : x
  2. Step 2: Convert to fraction form
    764.63/1,055.21 = 415.34/x
  3. Step 3: Cross multiply
    764.63x = 1,055.21 × 415.34
  4. Step 4: Simplify right side
    764.63x = 438,263.57
  5. Step 5: Solve for x
    x = 438,263.57/764.63
  6. Step 6: Final answer
    x = 573.17

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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.