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Finding the Fourth Proportional to 71.83, 107.76 and 65.41

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Solution

The fourth proportional to 71.83, 107.76 and 65.41 is: 98.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.83 : 107.76 = 65.41 : x
  2. Step 2: Convert to fraction form
    71.83/107.76 = 65.41/x
  3. Step 3: Cross multiply
    71.83x = 107.76 × 65.41
  4. Step 4: Simplify right side
    71.83x = 7,048.58
  5. Step 5: Solve for x
    x = 7,048.58/71.83
  6. Step 6: Final answer
    x = 98.13

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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.