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Finding the Fourth Proportional to 45.60, 68.40 and 18.57

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Solution

The fourth proportional to 45.60, 68.40 and 18.57 is: 27.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.60 : 68.40 = 18.57 : x
  2. Step 2: Convert to fraction form
    45.60/68.40 = 18.57/x
  3. Step 3: Cross multiply
    45.60x = 68.40 × 18.57
  4. Step 4: Simplify right side
    45.60x = 1,270.19
  5. Step 5: Solve for x
    x = 1,270.19/45.60
  6. Step 6: Final answer
    x = 27.86

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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.