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Finding the Fourth Proportional to 478.44, 717.66 and 421.74

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Solution

The fourth proportional to 478.44, 717.66 and 421.74 is: 632.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.44 : 717.66 = 421.74 : x
  2. Step 2: Convert to fraction form
    478.44/717.66 = 421.74/x
  3. Step 3: Cross multiply
    478.44x = 717.66 × 421.74
  4. Step 4: Simplify right side
    478.44x = 302,665.93
  5. Step 5: Solve for x
    x = 302,665.93/478.44
  6. Step 6: Final answer
    x = 632.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.