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Finding the Fourth Proportional to 55.42, 76.50 and 35.78

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Solution

The fourth proportional to 55.42, 76.50 and 35.78 is: 49.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.42 : 76.50 = 35.78 : x
  2. Step 2: Convert to fraction form
    55.42/76.50 = 35.78/x
  3. Step 3: Cross multiply
    55.42x = 76.50 × 35.78
  4. Step 4: Simplify right side
    55.42x = 2,737.17
  5. Step 5: Solve for x
    x = 2,737.17/55.42
  6. Step 6: Final answer
    x = 49.39

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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.