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Finding the Fourth Proportional to 55.85, 76.90 and 50.70

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Solution

The fourth proportional to 55.85, 76.90 and 50.70 is: 69.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.85 : 76.90 = 50.70 : x
  2. Step 2: Convert to fraction form
    55.85/76.90 = 50.70/x
  3. Step 3: Cross multiply
    55.85x = 76.90 × 50.70
  4. Step 4: Simplify right side
    55.85x = 3,898.83
  5. Step 5: Solve for x
    x = 3,898.83/55.85
  6. Step 6: Final answer
    x = 69.81

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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.