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Finding the Fourth Proportional to 603.20, 831.30 and 455.60

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Solution

The fourth proportional to 603.20, 831.30 and 455.60 is: 627.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.20 : 831.30 = 455.60 : x
  2. Step 2: Convert to fraction form
    603.20/831.30 = 455.60/x
  3. Step 3: Cross multiply
    603.20x = 831.30 × 455.60
  4. Step 4: Simplify right side
    603.20x = 378,740.28
  5. Step 5: Solve for x
    x = 378,740.28/603.20
  6. Step 6: Final answer
    x = 627.89

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.