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Finding the Fourth Proportional to 317.55, 438.21 and 177.67

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Solution

The fourth proportional to 317.55, 438.21 and 177.67 is: 245.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.55 : 438.21 = 177.67 : x
  2. Step 2: Convert to fraction form
    317.55/438.21 = 177.67/x
  3. Step 3: Cross multiply
    317.55x = 438.21 × 177.67
  4. Step 4: Simplify right side
    317.55x = 77,857.98
  5. Step 5: Solve for x
    x = 77,857.98/317.55
  6. Step 6: Final answer
    x = 245.18

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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.