Home / 134.20-201.31-42.87

Finding the Fourth Proportional to 134.20, 201.31 and 42.87

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Solution

The fourth proportional to 134.20, 201.31 and 42.87 is: 64.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    134.20 : 201.31 = 42.87 : x
  2. Step 2: Convert to fraction form
    134.20/201.31 = 42.87/x
  3. Step 3: Cross multiply
    134.20x = 201.31 × 42.87
  4. Step 4: Simplify right side
    134.20x = 8,630.16
  5. Step 5: Solve for x
    x = 8,630.16/134.20
  6. Step 6: Final answer
    x = 64.31

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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.