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Finding the Fourth Proportional to 162.80, 224.72 and 103.80

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Solution

The fourth proportional to 162.80, 224.72 and 103.80 is: 143.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    162.80 : 224.72 = 103.80 : x
  2. Step 2: Convert to fraction form
    162.80/224.72 = 103.80/x
  3. Step 3: Cross multiply
    162.80x = 224.72 × 103.80
  4. Step 4: Simplify right side
    162.80x = 23,325.42
  5. Step 5: Solve for x
    x = 23,325.42/162.80
  6. Step 6: Final answer
    x = 143.28

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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.