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Finding the Fourth Proportional to 374.09, 515.79 and 317.96

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Solution

The fourth proportional to 374.09, 515.79 and 317.96 is: 438.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.09 : 515.79 = 317.96 : x
  2. Step 2: Convert to fraction form
    374.09/515.79 = 317.96/x
  3. Step 3: Cross multiply
    374.09x = 515.79 × 317.96
  4. Step 4: Simplify right side
    374.09x = 163,998.01
  5. Step 5: Solve for x
    x = 163,998.01/374.09
  6. Step 6: Final answer
    x = 438.40

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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.