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Finding the Fourth Proportional to 45.46, 68.16 and 18.40

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Solution

The fourth proportional to 45.46, 68.16 and 18.40 is: 27.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.46 : 68.16 = 18.40 : x
  2. Step 2: Convert to fraction form
    45.46/68.16 = 18.40/x
  3. Step 3: Cross multiply
    45.46x = 68.16 × 18.40
  4. Step 4: Simplify right side
    45.46x = 1,254.14
  5. Step 5: Solve for x
    x = 1,254.14/45.46
  6. Step 6: Final answer
    x = 27.59

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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.