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Finding the Fourth Proportional to 481.28, 722.45 and 430.25

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Solution

The fourth proportional to 481.28, 722.45 and 430.25 is: 645.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.28 : 722.45 = 430.25 : x
  2. Step 2: Convert to fraction form
    481.28/722.45 = 430.25/x
  3. Step 3: Cross multiply
    481.28x = 722.45 × 430.25
  4. Step 4: Simplify right side
    481.28x = 310,831.58
  5. Step 5: Solve for x
    x = 310,831.58/481.28
  6. Step 6: Final answer
    x = 645.85

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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.