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Finding the Fourth Proportional to 76.62, 105.70 and 55.87

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Solution

The fourth proportional to 76.62, 105.70 and 55.87 is: 77.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.62 : 105.70 = 55.87 : x
  2. Step 2: Convert to fraction form
    76.62/105.70 = 55.87/x
  3. Step 3: Cross multiply
    76.62x = 105.70 × 55.87
  4. Step 4: Simplify right side
    76.62x = 5,905.46
  5. Step 5: Solve for x
    x = 5,905.46/76.62
  6. Step 6: Final answer
    x = 77.07

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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.