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Finding the Fourth Proportional to 479.53, 661.35 and 339.65

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Solution

The fourth proportional to 479.53, 661.35 and 339.65 is: 468.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.53 : 661.35 = 339.65 : x
  2. Step 2: Convert to fraction form
    479.53/661.35 = 339.65/x
  3. Step 3: Cross multiply
    479.53x = 661.35 × 339.65
  4. Step 4: Simplify right side
    479.53x = 224,627.53
  5. Step 5: Solve for x
    x = 224,627.53/479.53
  6. Step 6: Final answer
    x = 468.43

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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.