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Finding the Fourth Proportional to 55.50, 76.50 and 53.87

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Solution

The fourth proportional to 55.50, 76.50 and 53.87 is: 74.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.50 : 76.50 = 53.87 : x
  2. Step 2: Convert to fraction form
    55.50/76.50 = 53.87/x
  3. Step 3: Cross multiply
    55.50x = 76.50 × 53.87
  4. Step 4: Simplify right side
    55.50x = 4,121.20
  5. Step 5: Solve for x
    x = 4,121.20/55.50
  6. Step 6: Final answer
    x = 74.25

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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.