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Finding the Fourth Proportional to 763.36, 1,145.05 and 215.54

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Solution

The fourth proportional to 763.36, 1,145.05 and 215.54 is: 323.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.36 : 1,145.05 = 215.54 : x
  2. Step 2: Convert to fraction form
    763.36/1,145.05 = 215.54/x
  3. Step 3: Cross multiply
    763.36x = 1,145.05 × 215.54
  4. Step 4: Simplify right side
    763.36x = 246,809.76
  5. Step 5: Solve for x
    x = 246,809.76/763.36
  6. Step 6: Final answer
    x = 323.32

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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.