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Finding the Fourth Proportional to 479.32, 719.89 and 399.13

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Solution

The fourth proportional to 479.32, 719.89 and 399.13 is: 599.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    479.32 : 719.89 = 399.13 : x
  2. Step 2: Convert to fraction form
    479.32/719.89 = 399.13/x
  3. Step 3: Cross multiply
    479.32x = 719.89 × 399.13
  4. Step 4: Simplify right side
    479.32x = 287,326.90
  5. Step 5: Solve for x
    x = 287,326.90/479.32
  6. Step 6: Final answer
    x = 599.45

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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.