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Finding the Fourth Proportional to 108.35, 148.90 and 86.48

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Solution

The fourth proportional to 108.35, 148.90 and 86.48 is: 118.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.35 : 148.90 = 86.48 : x
  2. Step 2: Convert to fraction form
    108.35/148.90 = 86.48/x
  3. Step 3: Cross multiply
    108.35x = 148.90 × 86.48
  4. Step 4: Simplify right side
    108.35x = 12,875.91
  5. Step 5: Solve for x
    x = 12,875.91/108.35
  6. Step 6: Final answer
    x = 118.84

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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.