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Finding the Fourth Proportional to 310, 427.80 and 172

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Solution

The fourth proportional to 310, 427.80 and 172 is: 237.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    310 : 427.80 = 172 : x
  2. Step 2: Convert to fraction form
    310/427.80 = 172/x
  3. Step 3: Cross multiply
    310x = 427.80 × 172
  4. Step 4: Simplify right side
    310x = 73,581.60
  5. Step 5: Solve for x
    x = 73,581.60/310
  6. Step 6: Final answer
    x = 237.36

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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.