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Finding the Fourth Proportional to 207.81, 311.54 and 153.72

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Solution

The fourth proportional to 207.81, 311.54 and 153.72 is: 230.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.81 : 311.54 = 153.72 : x
  2. Step 2: Convert to fraction form
    207.81/311.54 = 153.72/x
  3. Step 3: Cross multiply
    207.81x = 311.54 × 153.72
  4. Step 4: Simplify right side
    207.81x = 47,889.16
  5. Step 5: Solve for x
    x = 47,889.16/207.81
  6. Step 6: Final answer
    x = 230.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.