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Finding the Fourth Proportional to 231.40, 319.34 and 156.74

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Solution

The fourth proportional to 231.40, 319.34 and 156.74 is: 216.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.40 : 319.34 = 156.74 : x
  2. Step 2: Convert to fraction form
    231.40/319.34 = 156.74/x
  3. Step 3: Cross multiply
    231.40x = 319.34 × 156.74
  4. Step 4: Simplify right side
    231.40x = 50,051.15
  5. Step 5: Solve for x
    x = 50,051.15/231.40
  6. Step 6: Final answer
    x = 216.30

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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.