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Finding the Fourth Proportional to 318.07, 477.21 and 144.87

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Solution

The fourth proportional to 318.07, 477.21 and 144.87 is: 217.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.07 : 477.21 = 144.87 : x
  2. Step 2: Convert to fraction form
    318.07/477.21 = 144.87/x
  3. Step 3: Cross multiply
    318.07x = 477.21 × 144.87
  4. Step 4: Simplify right side
    318.07x = 69,133.41
  5. Step 5: Solve for x
    x = 69,133.41/318.07
  6. Step 6: Final answer
    x = 217.35

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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.