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Finding the Fourth Proportional to 608.45, 913.21 and 432.81

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Solution

The fourth proportional to 608.45, 913.21 and 432.81 is: 649.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.45 : 913.21 = 432.81 : x
  2. Step 2: Convert to fraction form
    608.45/913.21 = 432.81/x
  3. Step 3: Cross multiply
    608.45x = 913.21 × 432.81
  4. Step 4: Simplify right side
    608.45x = 395,245.34
  5. Step 5: Solve for x
    x = 395,245.34/608.45
  6. Step 6: Final answer
    x = 649.60

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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.