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Finding the Fourth Proportional to 769.51, 1,060.04 and 645.17

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Solution

The fourth proportional to 769.51, 1,060.04 and 645.17 is: 888.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.51 : 1,060.04 = 645.17 : x
  2. Step 2: Convert to fraction form
    769.51/1,060.04 = 645.17/x
  3. Step 3: Cross multiply
    769.51x = 1,060.04 × 645.17
  4. Step 4: Simplify right side
    769.51x = 683,910.27
  5. Step 5: Solve for x
    x = 683,910.27/769.51
  6. Step 6: Final answer
    x = 888.76

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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.