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Finding the Fourth Proportional to 108.87, 150.21 and 65.19

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Solution

The fourth proportional to 108.87, 150.21 and 65.19 is: 89.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.87 : 150.21 = 65.19 : x
  2. Step 2: Convert to fraction form
    108.87/150.21 = 65.19/x
  3. Step 3: Cross multiply
    108.87x = 150.21 × 65.19
  4. Step 4: Simplify right side
    108.87x = 9,792.19
  5. Step 5: Solve for x
    x = 9,792.19/108.87
  6. Step 6: Final answer
    x = 89.94

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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.