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Finding the Fourth Proportional to 57.47, 78.99 and 55.85

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Solution

The fourth proportional to 57.47, 78.99 and 55.85 is: 76.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.47 : 78.99 = 55.85 : x
  2. Step 2: Convert to fraction form
    57.47/78.99 = 55.85/x
  3. Step 3: Cross multiply
    57.47x = 78.99 × 55.85
  4. Step 4: Simplify right side
    57.47x = 4,411.31
  5. Step 5: Solve for x
    x = 4,411.31/57.47
  6. Step 6: Final answer
    x = 76.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.