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Finding the Fourth Proportional to 764.96, 1,055.09 and 648.02

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Solution

The fourth proportional to 764.96, 1,055.09 and 648.02 is: 893.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.96 : 1,055.09 = 648.02 : x
  2. Step 2: Convert to fraction form
    764.96/1,055.09 = 648.02/x
  3. Step 3: Cross multiply
    764.96x = 1,055.09 × 648.02
  4. Step 4: Simplify right side
    764.96x = 683,710.91
  5. Step 5: Solve for x
    x = 683,710.91/764.96
  6. Step 6: Final answer
    x = 893.79

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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.