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Finding the Fourth Proportional to 317.79, 475.90 and 187.40

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Solution

The fourth proportional to 317.79, 475.90 and 187.40 is: 280.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.79 : 475.90 = 187.40 : x
  2. Step 2: Convert to fraction form
    317.79/475.90 = 187.40/x
  3. Step 3: Cross multiply
    317.79x = 475.90 × 187.40
  4. Step 4: Simplify right side
    317.79x = 89,183.66
  5. Step 5: Solve for x
    x = 89,183.66/317.79
  6. Step 6: Final answer
    x = 280.64

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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.