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Finding the Fourth Proportional to 482.56, 665.76 and 480.40

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Solution

The fourth proportional to 482.56, 665.76 and 480.40 is: 662.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    482.56 : 665.76 = 480.40 : x
  2. Step 2: Convert to fraction form
    482.56/665.76 = 480.40/x
  3. Step 3: Cross multiply
    482.56x = 665.76 × 480.40
  4. Step 4: Simplify right side
    482.56x = 319,831.10
  5. Step 5: Solve for x
    x = 319,831.10/482.56
  6. Step 6: Final answer
    x = 662.78

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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.