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Finding the Fourth Proportional to 479.76, 661.68 and 305.04

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Solution

The fourth proportional to 479.76, 661.68 and 305.04 is: 420.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.76 : 661.68 = 305.04 : x
  2. Step 2: Convert to fraction form
    479.76/661.68 = 305.04/x
  3. Step 3: Cross multiply
    479.76x = 661.68 × 305.04
  4. Step 4: Simplify right side
    479.76x = 201,838.87
  5. Step 5: Solve for x
    x = 201,838.87/479.76
  6. Step 6: Final answer
    x = 420.71

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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.