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Finding the Fourth Proportional to 479.69, 719.40 and 171.50

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Solution

The fourth proportional to 479.69, 719.40 and 171.50 is: 257.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.69 : 719.40 = 171.50 : x
  2. Step 2: Convert to fraction form
    479.69/719.40 = 171.50/x
  3. Step 3: Cross multiply
    479.69x = 719.40 × 171.50
  4. Step 4: Simplify right side
    479.69x = 123,379.54
  5. Step 5: Solve for x
    x = 123,379.54/479.69
  6. Step 6: Final answer
    x = 257.21

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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.