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Finding the Fourth Proportional to 45.44, 68.45 and 42.86

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Solution

The fourth proportional to 45.44, 68.45 and 42.86 is: 64.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.44 : 68.45 = 42.86 : x
  2. Step 2: Convert to fraction form
    45.44/68.45 = 42.86/x
  3. Step 3: Cross multiply
    45.44x = 68.45 × 42.86
  4. Step 4: Simplify right side
    45.44x = 2,933.77
  5. Step 5: Solve for x
    x = 2,933.77/45.44
  6. Step 6: Final answer
    x = 64.56

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.