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Finding the Fourth Proportional to 479.32, 661.68 and 339.72

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Solution

The fourth proportional to 479.32, 661.68 and 339.72 is: 468.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.32 : 661.68 = 339.72 : x
  2. Step 2: Convert to fraction form
    479.32/661.68 = 339.72/x
  3. Step 3: Cross multiply
    479.32x = 661.68 × 339.72
  4. Step 4: Simplify right side
    479.32x = 224,785.93
  5. Step 5: Solve for x
    x = 224,785.93/479.32
  6. Step 6: Final answer
    x = 468.97

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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.