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Finding the Fourth Proportional to 52.09, 71.85 and 31.36

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Solution

The fourth proportional to 52.09, 71.85 and 31.36 is: 43.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.09 : 71.85 = 31.36 : x
  2. Step 2: Convert to fraction form
    52.09/71.85 = 31.36/x
  3. Step 3: Cross multiply
    52.09x = 71.85 × 31.36
  4. Step 4: Simplify right side
    52.09x = 2,252.86
  5. Step 5: Solve for x
    x = 2,252.86/52.09
  6. Step 6: Final answer
    x = 43.25

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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.