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Finding the Fourth Proportional to 57.29, 78.58 and 55.33

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Solution

The fourth proportional to 57.29, 78.58 and 55.33 is: 75.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.29 : 78.58 = 55.33 : x
  2. Step 2: Convert to fraction form
    57.29/78.58 = 55.33/x
  3. Step 3: Cross multiply
    57.29x = 78.58 × 55.33
  4. Step 4: Simplify right side
    57.29x = 4,347.70
  5. Step 5: Solve for x
    x = 4,347.70/57.29
  6. Step 6: Final answer
    x = 75.90

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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.