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Finding the Fourth Proportional to 108.70, 162.78 and 59.87

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Solution

The fourth proportional to 108.70, 162.78 and 59.87 is: 89.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.70 : 162.78 = 59.87 : x
  2. Step 2: Convert to fraction form
    108.70/162.78 = 59.87/x
  3. Step 3: Cross multiply
    108.70x = 162.78 × 59.87
  4. Step 4: Simplify right side
    108.70x = 9,745.64
  5. Step 5: Solve for x
    x = 9,745.64/108.70
  6. Step 6: Final answer
    x = 89.66

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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.