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Finding the Fourth Proportional to 317.45, 476.39 and 155.05

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Solution

The fourth proportional to 317.45, 476.39 and 155.05 is: 232.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.45 : 476.39 = 155.05 : x
  2. Step 2: Convert to fraction form
    317.45/476.39 = 155.05/x
  3. Step 3: Cross multiply
    317.45x = 476.39 × 155.05
  4. Step 4: Simplify right side
    317.45x = 73,862.30
  5. Step 5: Solve for x
    x = 73,862.30/317.45
  6. Step 6: Final answer
    x = 232.67

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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.