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Finding the Fourth Proportional to 58.50, 80.76 and 54.90

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Solution

The fourth proportional to 58.50, 80.76 and 54.90 is: 75.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.50 : 80.76 = 54.90 : x
  2. Step 2: Convert to fraction form
    58.50/80.76 = 54.90/x
  3. Step 3: Cross multiply
    58.50x = 80.76 × 54.90
  4. Step 4: Simplify right side
    58.50x = 4,433.72
  5. Step 5: Solve for x
    x = 4,433.72/58.50
  6. Step 6: Final answer
    x = 75.79

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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.