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Finding the Fourth Proportional to 55.05, 75.78 and 50.94

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Solution

The fourth proportional to 55.05, 75.78 and 50.94 is: 70.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.05 : 75.78 = 50.94 : x
  2. Step 2: Convert to fraction form
    55.05/75.78 = 50.94/x
  3. Step 3: Cross multiply
    55.05x = 75.78 × 50.94
  4. Step 4: Simplify right side
    55.05x = 3,860.23
  5. Step 5: Solve for x
    x = 3,860.23/55.05
  6. Step 6: Final answer
    x = 70.12

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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.