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Finding the Fourth Proportional to 108.23, 162.42 and 56.91

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Solution

The fourth proportional to 108.23, 162.42 and 56.91 is: 85.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.23 : 162.42 = 56.91 : x
  2. Step 2: Convert to fraction form
    108.23/162.42 = 56.91/x
  3. Step 3: Cross multiply
    108.23x = 162.42 × 56.91
  4. Step 4: Simplify right side
    108.23x = 9,243.04
  5. Step 5: Solve for x
    x = 9,243.04/108.23
  6. Step 6: Final answer
    x = 85.40

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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.