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Finding the Fourth Proportional to 51.20, 76.45 and 48.32

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Solution

The fourth proportional to 51.20, 76.45 and 48.32 is: 72.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.20 : 76.45 = 48.32 : x
  2. Step 2: Convert to fraction form
    51.20/76.45 = 48.32/x
  3. Step 3: Cross multiply
    51.20x = 76.45 × 48.32
  4. Step 4: Simplify right side
    51.20x = 3,694.06
  5. Step 5: Solve for x
    x = 3,694.06/51.20
  6. Step 6: Final answer
    x = 72.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.