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Finding the Fourth Proportional to 51.40, 76.57 and 48.45

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Solution

The fourth proportional to 51.40, 76.57 and 48.45 is: 72.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.40 : 76.57 = 48.45 : x
  2. Step 2: Convert to fraction form
    51.40/76.57 = 48.45/x
  3. Step 3: Cross multiply
    51.40x = 76.57 × 48.45
  4. Step 4: Simplify right side
    51.40x = 3,709.82
  5. Step 5: Solve for x
    x = 3,709.82/51.40
  6. Step 6: Final answer
    x = 72.18

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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.