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Finding the Fourth Proportional to 108.34, 162.51 and 90.25

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Solution

The fourth proportional to 108.34, 162.51 and 90.25 is: 135.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.34 : 162.51 = 90.25 : x
  2. Step 2: Convert to fraction form
    108.34/162.51 = 90.25/x
  3. Step 3: Cross multiply
    108.34x = 162.51 × 90.25
  4. Step 4: Simplify right side
    108.34x = 14,665.78
  5. Step 5: Solve for x
    x = 14,665.78/108.34
  6. Step 6: Final answer
    x = 135.37

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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.