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Finding the Fourth Proportional to 342.45, 514.81 and 317.09

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Solution

The fourth proportional to 342.45, 514.81 and 317.09 is: 476.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.45 : 514.81 = 317.09 : x
  2. Step 2: Convert to fraction form
    342.45/514.81 = 317.09/x
  3. Step 3: Cross multiply
    342.45x = 514.81 × 317.09
  4. Step 4: Simplify right side
    342.45x = 163,238.93
  5. Step 5: Solve for x
    x = 163,238.93/342.45
  6. Step 6: Final answer
    x = 476.68

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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.