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Finding the Fourth Proportional to 57.23, 78.98 and 31.36

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Solution

The fourth proportional to 57.23, 78.98 and 31.36 is: 43.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.23 : 78.98 = 31.36 : x
  2. Step 2: Convert to fraction form
    57.23/78.98 = 31.36/x
  3. Step 3: Cross multiply
    57.23x = 78.98 × 31.36
  4. Step 4: Simplify right side
    57.23x = 2,476.69
  5. Step 5: Solve for x
    x = 2,476.69/57.23
  6. Step 6: Final answer
    x = 43.27

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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.