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Finding the Fourth Proportional to 231.64, 319.63 and 148.72

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Solution

The fourth proportional to 231.64, 319.63 and 148.72 is: 205.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.64 : 319.63 = 148.72 : x
  2. Step 2: Convert to fraction form
    231.64/319.63 = 148.72/x
  3. Step 3: Cross multiply
    231.64x = 319.63 × 148.72
  4. Step 4: Simplify right side
    231.64x = 47,535.37
  5. Step 5: Solve for x
    x = 47,535.37/231.64
  6. Step 6: Final answer
    x = 205.21

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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.