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Finding the Fourth Proportional to 479.74, 661.29 and 386.32

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Solution

The fourth proportional to 479.74, 661.29 and 386.32 is: 532.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.74 : 661.29 = 386.32 : x
  2. Step 2: Convert to fraction form
    479.74/661.29 = 386.32/x
  3. Step 3: Cross multiply
    479.74x = 661.29 × 386.32
  4. Step 4: Simplify right side
    479.74x = 255,469.55
  5. Step 5: Solve for x
    x = 255,469.55/479.74
  6. Step 6: Final answer
    x = 532.52

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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.