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Finding the Fourth Proportional to 231.64, 347.56 and 87.40

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Solution

The fourth proportional to 231.64, 347.56 and 87.40 is: 131.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.64 : 347.56 = 87.40 : x
  2. Step 2: Convert to fraction form
    231.64/347.56 = 87.40/x
  3. Step 3: Cross multiply
    231.64x = 347.56 × 87.40
  4. Step 4: Simplify right side
    231.64x = 30,376.74
  5. Step 5: Solve for x
    x = 30,376.74/231.64
  6. Step 6: Final answer
    x = 131.14

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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.