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Finding the Fourth Proportional to 45.47, 68.49 and 42.12

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Solution

The fourth proportional to 45.47, 68.49 and 42.12 is: 63.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.47 : 68.49 = 42.12 : x
  2. Step 2: Convert to fraction form
    45.47/68.49 = 42.12/x
  3. Step 3: Cross multiply
    45.47x = 68.49 × 42.12
  4. Step 4: Simplify right side
    45.47x = 2,884.80
  5. Step 5: Solve for x
    x = 2,884.80/45.47
  6. Step 6: Final answer
    x = 63.45

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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.