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Finding the Fourth Proportional to 162.16, 223.70 and 129.46

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Solution

The fourth proportional to 162.16, 223.70 and 129.46 is: 178.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.16 : 223.70 = 129.46 : x
  2. Step 2: Convert to fraction form
    162.16/223.70 = 129.46/x
  3. Step 3: Cross multiply
    162.16x = 223.70 × 129.46
  4. Step 4: Simplify right side
    162.16x = 28,960.20
  5. Step 5: Solve for x
    x = 28,960.20/162.16
  6. Step 6: Final answer
    x = 178.59

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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.