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Finding the Fourth Proportional to 162.40, 223.85 and 124.64

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Solution

The fourth proportional to 162.40, 223.85 and 124.64 is: 171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.40 : 223.85 = 124.64 : x
  2. Step 2: Convert to fraction form
    162.40/223.85 = 124.64/x
  3. Step 3: Cross multiply
    162.40x = 223.85 × 124.64
  4. Step 4: Simplify right side
    162.40x = 27,899.54
  5. Step 5: Solve for x
    x = 27,899.54/162.40
  6. Step 6: Final answer
    x = 171.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.