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Finding the Fourth Proportional to 71.61, 107.43 and 51.33

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Solution

The fourth proportional to 71.61, 107.43 and 51.33 is: 77.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.61 : 107.43 = 51.33 : x
  2. Step 2: Convert to fraction form
    71.61/107.43 = 51.33/x
  3. Step 3: Cross multiply
    71.61x = 107.43 × 51.33
  4. Step 4: Simplify right side
    71.61x = 5,514.38
  5. Step 5: Solve for x
    x = 5,514.38/71.61
  6. Step 6: Final answer
    x = 77.01

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.