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Finding the Fourth Proportional to 51.85, 71.47 and 40.91

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Solution

The fourth proportional to 51.85, 71.47 and 40.91 is: 56.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    51.85 : 71.47 = 40.91 : x
  2. Step 2: Convert to fraction form
    51.85/71.47 = 40.91/x
  3. Step 3: Cross multiply
    51.85x = 71.47 × 40.91
  4. Step 4: Simplify right side
    51.85x = 2,923.84
  5. Step 5: Solve for x
    x = 2,923.84/51.85
  6. Step 6: Final answer
    x = 56.39

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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.