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Finding the Fourth Proportional to 479.13, 661.58 and 321.90

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Solution

The fourth proportional to 479.13, 661.58 and 321.90 is: 444.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.13 : 661.58 = 321.90 : x
  2. Step 2: Convert to fraction form
    479.13/661.58 = 321.90/x
  3. Step 3: Cross multiply
    479.13x = 661.58 × 321.90
  4. Step 4: Simplify right side
    479.13x = 212,958.51
  5. Step 5: Solve for x
    x = 212,958.51/479.13
  6. Step 6: Final answer
    x = 444.47

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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.