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Finding the Fourth Proportional to 479.75, 719.63 and 137.75

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Solution

The fourth proportional to 479.75, 719.63 and 137.75 is: 206.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.75 : 719.63 = 137.75 : x
  2. Step 2: Convert to fraction form
    479.75/719.63 = 137.75/x
  3. Step 3: Cross multiply
    479.75x = 719.63 × 137.75
  4. Step 4: Simplify right side
    479.75x = 99,128.34
  5. Step 5: Solve for x
    x = 99,128.34/479.75
  6. Step 6: Final answer
    x = 206.63

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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.