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Finding the Fourth Proportional to 108.21, 148.64 and 89.76

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Solution

The fourth proportional to 108.21, 148.64 and 89.76 is: 123.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.21 : 148.64 = 89.76 : x
  2. Step 2: Convert to fraction form
    108.21/148.64 = 89.76/x
  3. Step 3: Cross multiply
    108.21x = 148.64 × 89.76
  4. Step 4: Simplify right side
    108.21x = 13,341.48
  5. Step 5: Solve for x
    x = 13,341.48/108.21
  6. Step 6: Final answer
    x = 123.29

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.