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Finding the Fourth Proportional to 108.78, 162.53 and 103.74

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Solution

The fourth proportional to 108.78, 162.53 and 103.74 is: 154.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.78 : 162.53 = 103.74 : x
  2. Step 2: Convert to fraction form
    108.78/162.53 = 103.74/x
  3. Step 3: Cross multiply
    108.78x = 162.53 × 103.74
  4. Step 4: Simplify right side
    108.78x = 16,860.34
  5. Step 5: Solve for x
    x = 16,860.34/108.78
  6. Step 6: Final answer
    x = 154.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.