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Finding the Fourth Proportional to 479.55, 661.44 and 339.66

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Solution

The fourth proportional to 479.55, 661.44 and 339.66 is: 468.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.55 : 661.44 = 339.66 : x
  2. Step 2: Convert to fraction form
    479.55/661.44 = 339.66/x
  3. Step 3: Cross multiply
    479.55x = 661.44 × 339.66
  4. Step 4: Simplify right side
    479.55x = 224,664.71
  5. Step 5: Solve for x
    x = 224,664.71/479.55
  6. Step 6: Final answer
    x = 468.49

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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.