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Finding the Fourth Proportional to 57.76, 86.99 and 45.82

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Solution

The fourth proportional to 57.76, 86.99 and 45.82 is: 69.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 86.99 = 45.82 : x
  2. Step 2: Convert to fraction form
    57.76/86.99 = 45.82/x
  3. Step 3: Cross multiply
    57.76x = 86.99 × 45.82
  4. Step 4: Simplify right side
    57.76x = 3,985.88
  5. Step 5: Solve for x
    x = 3,985.88/57.76
  6. Step 6: Final answer
    x = 69.01

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.