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Finding the Fourth Proportional to 440.48, 655.30 and 423.20

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Solution

The fourth proportional to 440.48, 655.30 and 423.20 is: 629.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.48 : 655.30 = 423.20 : x
  2. Step 2: Convert to fraction form
    440.48/655.30 = 423.20/x
  3. Step 3: Cross multiply
    440.48x = 655.30 × 423.20
  4. Step 4: Simplify right side
    440.48x = 277,322.96
  5. Step 5: Solve for x
    x = 277,322.96/440.48
  6. Step 6: Final answer
    x = 629.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.