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Finding the Fourth Proportional to 763.88, 1,145.68 and 215.93

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Solution

The fourth proportional to 763.88, 1,145.68 and 215.93 is: 323.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.88 : 1,145.68 = 215.93 : x
  2. Step 2: Convert to fraction form
    763.88/1,145.68 = 215.93/x
  3. Step 3: Cross multiply
    763.88x = 1,145.68 × 215.93
  4. Step 4: Simplify right side
    763.88x = 247,385.60
  5. Step 5: Solve for x
    x = 247,385.60/763.88
  6. Step 6: Final answer
    x = 323.85

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.