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Finding the Fourth Proportional to 756.08, 1,042.44 and 645.92

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Solution

The fourth proportional to 756.08, 1,042.44 and 645.92 is: 890.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.08 : 1,042.44 = 645.92 : x
  2. Step 2: Convert to fraction form
    756.08/1,042.44 = 645.92/x
  3. Step 3: Cross multiply
    756.08x = 1,042.44 × 645.92
  4. Step 4: Simplify right side
    756.08x = 673,332.84
  5. Step 5: Solve for x
    x = 673,332.84/756.08
  6. Step 6: Final answer
    x = 890.56

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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.