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Finding the Fourth Proportional to 479.70, 661.86 and 339.84

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Solution

The fourth proportional to 479.70, 661.86 and 339.84 is: 468.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.70 : 661.86 = 339.84 : x
  2. Step 2: Convert to fraction form
    479.70/661.86 = 339.84/x
  3. Step 3: Cross multiply
    479.70x = 661.86 × 339.84
  4. Step 4: Simplify right side
    479.70x = 224,926.50
  5. Step 5: Solve for x
    x = 224,926.50/479.70
  6. Step 6: Final answer
    x = 468.89

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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.