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Finding the Fourth Proportional to 126.31, 189.32 and 74.99

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Solution

The fourth proportional to 126.31, 189.32 and 74.99 is: 112.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    126.31 : 189.32 = 74.99 : x
  2. Step 2: Convert to fraction form
    126.31/189.32 = 74.99/x
  3. Step 3: Cross multiply
    126.31x = 189.32 × 74.99
  4. Step 4: Simplify right side
    126.31x = 14,196.73
  5. Step 5: Solve for x
    x = 14,196.73/126.31
  6. Step 6: Final answer
    x = 112.40

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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.