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Finding the Fourth Proportional to 317.55, 438.21 and 186.60

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Solution

The fourth proportional to 317.55, 438.21 and 186.60 is: 257.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.55 : 438.21 = 186.60 : x
  2. Step 2: Convert to fraction form
    317.55/438.21 = 186.60/x
  3. Step 3: Cross multiply
    317.55x = 438.21 × 186.60
  4. Step 4: Simplify right side
    317.55x = 81,769.99
  5. Step 5: Solve for x
    x = 81,769.99/317.55
  6. Step 6: Final answer
    x = 257.50

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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.