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Finding the Fourth Proportional to 514.75, 709.93 and 318.12

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Solution

The fourth proportional to 514.75, 709.93 and 318.12 is: 438.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    514.75 : 709.93 = 318.12 : x
  2. Step 2: Convert to fraction form
    514.75/709.93 = 318.12/x
  3. Step 3: Cross multiply
    514.75x = 709.93 × 318.12
  4. Step 4: Simplify right side
    514.75x = 225,837.79
  5. Step 5: Solve for x
    x = 225,837.79/514.75
  6. Step 6: Final answer
    x = 438.74

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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.