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Finding the Fourth Proportional to 479.58, 722.89 and 438.54

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Solution

The fourth proportional to 479.58, 722.89 and 438.54 is: 661.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.58 : 722.89 = 438.54 : x
  2. Step 2: Convert to fraction form
    479.58/722.89 = 438.54/x
  3. Step 3: Cross multiply
    479.58x = 722.89 × 438.54
  4. Step 4: Simplify right side
    479.58x = 317,016.18
  5. Step 5: Solve for x
    x = 317,016.18/479.58
  6. Step 6: Final answer
    x = 661.03

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.