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Finding the Fourth Proportional to 479.99, 719.86 and 171.80

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Solution

The fourth proportional to 479.99, 719.86 and 171.80 is: 257.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.99 : 719.86 = 171.80 : x
  2. Step 2: Convert to fraction form
    479.99/719.86 = 171.80/x
  3. Step 3: Cross multiply
    479.99x = 719.86 × 171.80
  4. Step 4: Simplify right side
    479.99x = 123,671.95
  5. Step 5: Solve for x
    x = 123,671.95/479.99
  6. Step 6: Final answer
    x = 257.66

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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.