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Finding the Fourth Proportional to 45.76, 68.96 and 42.28

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Solution

The fourth proportional to 45.76, 68.96 and 42.28 is: 63.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.76 : 68.96 = 42.28 : x
  2. Step 2: Convert to fraction form
    45.76/68.96 = 42.28/x
  3. Step 3: Cross multiply
    45.76x = 68.96 × 42.28
  4. Step 4: Simplify right side
    45.76x = 2,915.63
  5. Step 5: Solve for x
    x = 2,915.63/45.76
  6. Step 6: Final answer
    x = 63.72

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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.