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Finding the Fourth Proportional to 479.70, 719.57 and 399.11

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Solution

The fourth proportional to 479.70, 719.57 and 399.11 is: 598.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.70 : 719.57 = 399.11 : x
  2. Step 2: Convert to fraction form
    479.70/719.57 = 399.11/x
  3. Step 3: Cross multiply
    479.70x = 719.57 × 399.11
  4. Step 4: Simplify right side
    479.70x = 287,187.58
  5. Step 5: Solve for x
    x = 287,187.58/479.70
  6. Step 6: Final answer
    x = 598.68

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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.