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Finding the Fourth Proportional to 763.57, 1,145.35 and 215.75

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Solution

The fourth proportional to 763.57, 1,145.35 and 215.75 is: 323.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.57 : 1,145.35 = 215.75 : x
  2. Step 2: Convert to fraction form
    763.57/1,145.35 = 215.75/x
  3. Step 3: Cross multiply
    763.57x = 1,145.35 × 215.75
  4. Step 4: Simplify right side
    763.57x = 247,108.10
  5. Step 5: Solve for x
    x = 247,108.10/763.57
  6. Step 6: Final answer
    x = 323.62

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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.