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Finding the Fourth Proportional to 479.04, 715.28 and 421.44

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Solution

The fourth proportional to 479.04, 715.28 and 421.44 is: 629.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.04 : 715.28 = 421.44 : x
  2. Step 2: Convert to fraction form
    479.04/715.28 = 421.44/x
  3. Step 3: Cross multiply
    479.04x = 715.28 × 421.44
  4. Step 4: Simplify right side
    479.04x = 301,447.60
  5. Step 5: Solve for x
    x = 301,447.60/479.04
  6. Step 6: Final answer
    x = 629.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.