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Finding the Fourth Proportional to 479.13, 720.74 and 417.61

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Solution

The fourth proportional to 479.13, 720.74 and 417.61 is: 628.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.13 : 720.74 = 417.61 : x
  2. Step 2: Convert to fraction form
    479.13/720.74 = 417.61/x
  3. Step 3: Cross multiply
    479.13x = 720.74 × 417.61
  4. Step 4: Simplify right side
    479.13x = 300,988.23
  5. Step 5: Solve for x
    x = 300,988.23/479.13
  6. Step 6: Final answer
    x = 628.20

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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.