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Finding the Fourth Proportional to 432.80, 649.45 and 259.89

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Solution

The fourth proportional to 432.80, 649.45 and 259.89 is: 389.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    432.80 : 649.45 = 259.89 : x
  2. Step 2: Convert to fraction form
    432.80/649.45 = 259.89/x
  3. Step 3: Cross multiply
    432.80x = 649.45 × 259.89
  4. Step 4: Simplify right side
    432.80x = 168,785.56
  5. Step 5: Solve for x
    x = 168,785.56/432.80
  6. Step 6: Final answer
    x = 389.99

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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.