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Finding the Fourth Proportional to 51.28, 70.90 and 45.20

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Solution

The fourth proportional to 51.28, 70.90 and 45.20 is: 62.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.28 : 70.90 = 45.20 : x
  2. Step 2: Convert to fraction form
    51.28/70.90 = 45.20/x
  3. Step 3: Cross multiply
    51.28x = 70.90 × 45.20
  4. Step 4: Simplify right side
    51.28x = 3,204.68
  5. Step 5: Solve for x
    x = 3,204.68/51.28
  6. Step 6: Final answer
    x = 62.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.