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Finding the Fourth Proportional to 768.70, 1,060.87 and 628.42

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Solution

The fourth proportional to 768.70, 1,060.87 and 628.42 is: 867.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.70 : 1,060.87 = 628.42 : x
  2. Step 2: Convert to fraction form
    768.70/1,060.87 = 628.42/x
  3. Step 3: Cross multiply
    768.70x = 1,060.87 × 628.42
  4. Step 4: Simplify right side
    768.70x = 666,670.15
  5. Step 5: Solve for x
    x = 666,670.15/768.70
  6. Step 6: Final answer
    x = 867.27

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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.