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Finding the Fourth Proportional to 763.55, 1,145.31 and 215.72

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Solution

The fourth proportional to 763.55, 1,145.31 and 215.72 is: 323.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.55 : 1,145.31 = 215.72 : x
  2. Step 2: Convert to fraction form
    763.55/1,145.31 = 215.72/x
  3. Step 3: Cross multiply
    763.55x = 1,145.31 × 215.72
  4. Step 4: Simplify right side
    763.55x = 247,066.27
  5. Step 5: Solve for x
    x = 247,066.27/763.55
  6. Step 6: Final answer
    x = 323.58

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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.