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Finding the Fourth Proportional to 318.60, 477.90 and 156.14

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Solution

The fourth proportional to 318.60, 477.90 and 156.14 is: 234.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.60 : 477.90 = 156.14 : x
  2. Step 2: Convert to fraction form
    318.60/477.90 = 156.14/x
  3. Step 3: Cross multiply
    318.60x = 477.90 × 156.14
  4. Step 4: Simplify right side
    318.60x = 74,619.31
  5. Step 5: Solve for x
    x = 74,619.31/318.60
  6. Step 6: Final answer
    x = 234.21

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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.