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Finding the Fourth Proportional to 311.99, 430.54 and 172.10

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Solution

The fourth proportional to 311.99, 430.54 and 172.10 is: 237.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.99 : 430.54 = 172.10 : x
  2. Step 2: Convert to fraction form
    311.99/430.54 = 172.10/x
  3. Step 3: Cross multiply
    311.99x = 430.54 × 172.10
  4. Step 4: Simplify right side
    311.99x = 74,096.58
  5. Step 5: Solve for x
    x = 74,096.58/311.99
  6. Step 6: Final answer
    x = 237.50

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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.