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Finding the Fourth Proportional to 318.02, 438.78 and 207.50

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Solution

The fourth proportional to 318.02, 438.78 and 207.50 is: 286.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.02 : 438.78 = 207.50 : x
  2. Step 2: Convert to fraction form
    318.02/438.78 = 207.50/x
  3. Step 3: Cross multiply
    318.02x = 438.78 × 207.50
  4. Step 4: Simplify right side
    318.02x = 91,046.85
  5. Step 5: Solve for x
    x = 91,046.85/318.02
  6. Step 6: Final answer
    x = 286.29

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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.