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Finding the Fourth Proportional to 399.19, 550.83 and 316.51

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Solution

The fourth proportional to 399.19, 550.83 and 316.51 is: 436.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.19 : 550.83 = 316.51 : x
  2. Step 2: Convert to fraction form
    399.19/550.83 = 316.51/x
  3. Step 3: Cross multiply
    399.19x = 550.83 × 316.51
  4. Step 4: Simplify right side
    399.19x = 174,343.20
  5. Step 5: Solve for x
    x = 174,343.20/399.19
  6. Step 6: Final answer
    x = 436.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.