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Finding the Fourth Proportional to 763.92, 1,053.27 and 645.68

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Solution

The fourth proportional to 763.92, 1,053.27 and 645.68 is: 890.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.92 : 1,053.27 = 645.68 : x
  2. Step 2: Convert to fraction form
    763.92/1,053.27 = 645.68/x
  3. Step 3: Cross multiply
    763.92x = 1,053.27 × 645.68
  4. Step 4: Simplify right side
    763.92x = 680,078.01
  5. Step 5: Solve for x
    x = 680,078.01/763.92
  6. Step 6: Final answer
    x = 890.25

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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.