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Finding the Fourth Proportional to 108.31, 162.80 and 72.47

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Solution

The fourth proportional to 108.31, 162.80 and 72.47 is: 108.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.31 : 162.80 = 72.47 : x
  2. Step 2: Convert to fraction form
    108.31/162.80 = 72.47/x
  3. Step 3: Cross multiply
    108.31x = 162.80 × 72.47
  4. Step 4: Simplify right side
    108.31x = 11,798.12
  5. Step 5: Solve for x
    x = 11,798.12/108.31
  6. Step 6: Final answer
    x = 108.93

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.