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Finding the Fourth Proportional to 479.19, 717.29 and 438.81

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Solution

The fourth proportional to 479.19, 717.29 and 438.81 is: 656.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.19 : 717.29 = 438.81 : x
  2. Step 2: Convert to fraction form
    479.19/717.29 = 438.81/x
  3. Step 3: Cross multiply
    479.19x = 717.29 × 438.81
  4. Step 4: Simplify right side
    479.19x = 314,754.02
  5. Step 5: Solve for x
    x = 314,754.02/479.19
  6. Step 6: Final answer
    x = 656.85

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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.