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Finding the Fourth Proportional to 58.10, 80.21 and 39.77

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Solution

The fourth proportional to 58.10, 80.21 and 39.77 is: 54.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.10 : 80.21 = 39.77 : x
  2. Step 2: Convert to fraction form
    58.10/80.21 = 39.77/x
  3. Step 3: Cross multiply
    58.10x = 80.21 × 39.77
  4. Step 4: Simplify right side
    58.10x = 3,190.18
  5. Step 5: Solve for x
    x = 3,190.18/58.10
  6. Step 6: Final answer
    x = 54.91

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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.