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Finding the Fourth Proportional to 161.58, 223.08 and 139.70

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Solution

The fourth proportional to 161.58, 223.08 and 139.70 is: 192.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.58 : 223.08 = 139.70 : x
  2. Step 2: Convert to fraction form
    161.58/223.08 = 139.70/x
  3. Step 3: Cross multiply
    161.58x = 223.08 × 139.70
  4. Step 4: Simplify right side
    161.58x = 31,164.28
  5. Step 5: Solve for x
    x = 31,164.28/161.58
  6. Step 6: Final answer
    x = 192.87

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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.