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Finding the Fourth Proportional to 765.45, 1,148.07 and 217.68

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Solution

The fourth proportional to 765.45, 1,148.07 and 217.68 is: 326.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.45 : 1,148.07 = 217.68 : x
  2. Step 2: Convert to fraction form
    765.45/1,148.07 = 217.68/x
  3. Step 3: Cross multiply
    765.45x = 1,148.07 × 217.68
  4. Step 4: Simplify right side
    765.45x = 249,911.88
  5. Step 5: Solve for x
    x = 249,911.88/765.45
  6. Step 6: Final answer
    x = 326.49

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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.