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Finding the Fourth Proportional to 432.28, 647.99 and 328.19

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Solution

The fourth proportional to 432.28, 647.99 and 328.19 is: 491.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.28 : 647.99 = 328.19 : x
  2. Step 2: Convert to fraction form
    432.28/647.99 = 328.19/x
  3. Step 3: Cross multiply
    432.28x = 647.99 × 328.19
  4. Step 4: Simplify right side
    432.28x = 212,662.20
  5. Step 5: Solve for x
    x = 212,662.20/432.28
  6. Step 6: Final answer
    x = 491.96

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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.