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Finding the Fourth Proportional to 603.10, 831.99 and 393.45

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Solution

The fourth proportional to 603.10, 831.99 and 393.45 is: 542.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.10 : 831.99 = 393.45 : x
  2. Step 2: Convert to fraction form
    603.10/831.99 = 393.45/x
  3. Step 3: Cross multiply
    603.10x = 831.99 × 393.45
  4. Step 4: Simplify right side
    603.10x = 327,346.58
  5. Step 5: Solve for x
    x = 327,346.58/603.10
  6. Step 6: Final answer
    x = 542.78

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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.