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Finding the Fourth Proportional to 763.12, 1,144.71 and 215.26

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Solution

The fourth proportional to 763.12, 1,144.71 and 215.26 is: 322.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.12 : 1,144.71 = 215.26 : x
  2. Step 2: Convert to fraction form
    763.12/1,144.71 = 215.26/x
  3. Step 3: Cross multiply
    763.12x = 1,144.71 × 215.26
  4. Step 4: Simplify right side
    763.12x = 246,410.27
  5. Step 5: Solve for x
    x = 246,410.27/763.12
  6. Step 6: Final answer
    x = 322.90

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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.