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Finding the Fourth Proportional to 78.37, 108.21 and 60.05

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Solution

The fourth proportional to 78.37, 108.21 and 60.05 is: 82.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.37 : 108.21 = 60.05 : x
  2. Step 2: Convert to fraction form
    78.37/108.21 = 60.05/x
  3. Step 3: Cross multiply
    78.37x = 108.21 × 60.05
  4. Step 4: Simplify right side
    78.37x = 6,497.76
  5. Step 5: Solve for x
    x = 6,497.76/78.37
  6. Step 6: Final answer
    x = 82.91

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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.