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Finding the Fourth Proportional to 317.70, 438.38 and 177.80

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Solution

The fourth proportional to 317.70, 438.38 and 177.80 is: 245.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.70 : 438.38 = 177.80 : x
  2. Step 2: Convert to fraction form
    317.70/438.38 = 177.80/x
  3. Step 3: Cross multiply
    317.70x = 438.38 × 177.80
  4. Step 4: Simplify right side
    317.70x = 77,943.96
  5. Step 5: Solve for x
    x = 77,943.96/317.70
  6. Step 6: Final answer
    x = 245.34

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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.