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Finding the Fourth Proportional to 479.70, 720.09 and 317.70

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Solution

The fourth proportional to 479.70, 720.09 and 317.70 is: 476.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.70 : 720.09 = 317.70 : x
  2. Step 2: Convert to fraction form
    479.70/720.09 = 317.70/x
  3. Step 3: Cross multiply
    479.70x = 720.09 × 317.70
  4. Step 4: Simplify right side
    479.70x = 228,772.59
  5. Step 5: Solve for x
    x = 228,772.59/479.70
  6. Step 6: Final answer
    x = 476.91

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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.