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Finding the Fourth Proportional to 108.36, 162.55 and 47.45

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Solution

The fourth proportional to 108.36, 162.55 and 47.45 is: 71.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.36 : 162.55 = 47.45 : x
  2. Step 2: Convert to fraction form
    108.36/162.55 = 47.45/x
  3. Step 3: Cross multiply
    108.36x = 162.55 × 47.45
  4. Step 4: Simplify right side
    108.36x = 7,713.29
  5. Step 5: Solve for x
    x = 7,713.29/108.36
  6. Step 6: Final answer
    x = 71.18

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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.