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Finding the Fourth Proportional to 479.30, 661.20 and 304.70

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Solution

The fourth proportional to 479.30, 661.20 and 304.70 is: 420.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.30 : 661.20 = 304.70 : x
  2. Step 2: Convert to fraction form
    479.30/661.20 = 304.70/x
  3. Step 3: Cross multiply
    479.30x = 661.20 × 304.70
  4. Step 4: Simplify right side
    479.30x = 201,467.64
  5. Step 5: Solve for x
    x = 201,467.64/479.30
  6. Step 6: Final answer
    x = 420.34

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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.